The GEO files disappear. A bank is robbed. Two brothers are drawn toward an expedition lost twenty years ago. Every discovery brings the detective closer to a truth about his own life.
1. The island that should not exist
Twenty years before the main action, an expedition sets out to investigate a discovery that may change the geographical map of the world. The scientist Alex Ness and his wife Sofia are aboard a small aircraft with the pilots Richie and Yakov and other members of the geological team. They are not on an ordinary sightseeing flight. Beyond the familiar routes lies a patch of ocean where observation and navigation are unreliable, a region associated with an extraordinary atmospheric anomaly. Beneath that veil, researchers suspect the presence of land previously unknown to science. If the island exists, its geology may also explain reports of valuable mineral deposits.
Alex is an enthusiastic geologist with an almost irresistible fascination for islands. For him, each isolated piece of land is a natural laboratory, an opportunity to witness the history of the Earth in a particularly concentrated form. Sofia understands his excitement, but her nervousness is justified. The flight is risky, the weather is unpredictable, and the ordinary rules of navigation offer little comfort when an aircraft begins to behave strangely. An unexpected crisis forces the crew to consider an emergency landing at the very place they hoped merely to survey.
Richie has to make a decision under pressure. He cannot simply return to safety, and the plane may not be able to remain aloft much longer. The passengers are warned that the landing will be rough. The name of their destination is Harry Island. The prologue closes on that announcement. The reader is left to imagine what happened as the aircraft descended toward a shore that could not be found on ordinary maps. The novel then moves forward by two decades, replacing the threatened explorers with a detective who has no apparent reason to connect himself with their fate.
2. The most particular detective in the City
Twenty years later, Antonio Ness is a celebrated private detective in a busy city inhabited by animals whose professions, habits and anxieties are recognisably human. Antonio is a mouse of impeccable manners, precise routines and strong opinions about everything from clothing to justice. His mornings begin early. He dresses with almost ceremonial care, takes pride in his reputation and notices details that other people pass without a second thought. His confidence sometimes borders on vanity, but his extraordinary persistence and sharp reasoning have earned him the respect of the public and the police.
His detective agency is also a small world of relationships. Nicholas, a lion and his trusted assistant, is loyal, energetic and eager to learn. Henry, the wolf who drives Antonio, knows that the detective can get lost in thought at the least convenient moment. The police officer Arkady, a rhinoceros with a complicated past, is both a valuable colleague and a genuine friend. Their conversations reveal Antonio's defining mixture of self-assurance, humour and moral seriousness: he can joke about being unrivalled, yet he insists that even the most ordinary citizen deserves help and respect.
At first, there appears to be no mystery worthy of his abilities. Antonio moves through everyday tasks, unexpected social invitations and minor puzzles. A peculiar car that was suddenly repainted and fitted with different wheels catches his attention because he has learned not to dismiss unusual behaviour as a coincidence. It is precisely this alertness that prepares the reader for the larger case. The detective may seem to control every detail of his life, but the investigation ahead will challenge not only his skill but also everything he believes he knows about himself.
3. The missing files at GEO
Arkady asks Antonio to look into a troubling case at a geological research centre called GEO. Important documents have disappeared, and an employee associated with them is missing as well. The police have little to go on. It is not clear whether the theft is an act of industrial espionage, an attempt to conceal research, or something more personal. Antonio accepts almost immediately. After a succession of unremarkable days he is delighted to have a serious investigation, though he soon senses that his usual confidence may be premature.
The documents are not random papers. They lead toward an old expedition and the strange island that had occupied geologists many years earlier. Antonio needs to establish who had access to the files, what information they contained and why anyone would consider them valuable now. His friend Arkady trusts him, but his own police responsibilities limit what he can reveal or permit. Antonio therefore works through the network of helpers he has accumulated over the years, asking questions that seem insignificant until the answers begin to echo one another.
At this stage the case still appears solvable by conventional methods: follow the missing worker, examine records, question witnesses, check dates and reconstruct movements. Yet the evidence refuses to remain orderly. A name heard in one conversation reappears in another setting; an ordinary visit reveals a geographical clue; and the island, supposedly absent from modern maps, becomes an increasingly persistent presence in Antonio's thoughts. The detective is used to solving other people's mysteries. He has not yet imagined that the most important missing evidence could belong to his own past.
4. A restaurant and a name on the map
Antonio's young assistant Nicholas has a circle of friends outside the agency, including the Doberman Dani, who runs a popular restaurant. During a visit the detective notices a wall map marked with a red cross. It is not a routine decoration. The location seems connected to the material he has just encountered while investigating GEO. The restaurant itself is named Harry Island. This is too remarkable a coincidence for Antonio to ignore, and he returns to question its owner directly.
Dani does not behave like a criminal hiding a secret. He welcomes the detective, offers tea and explains that the restaurant's unusual name was chosen by his father, who had founded the business. In the family papers there are traces of an earlier scientific story. One preserved letter concerns an island concealed by a curious atmospheric phenomenon, a place which careful observation had finally made possible to detect. The geologist who wrote it refers to the prospect of an expedition and even suggests the name Harry Island, associating it with gold.
The importance of the discovery is twofold. First, the restaurant provides an independent link between GEO's present-day theft and research carried out many years ago. Second, it confirms that the island is neither a mere rumour nor a convenient invention by a thief. The trail is real, but it reaches backward through old correspondence and uncertain testimony. Antonio sees that geography and memory have become parts of the same puzzle. His questions to Dani also demonstrate his method: he does not accuse a helpful stranger simply because a clue points toward him. He listens, compares accounts and leaves with more questions than he arrived with.
5. An ordinary robbery becomes another case
While Antonio examines the GEO documents, the City is shaken by a bold bank robbery. The security system is disabled for a short interval, and a gang of mice carries out the crime with unnerving efficiency. A witness reports seeing a figure who looks exactly like the famous detective. The allegation is absurd to Antonio, who has spent his professional life helping the police. Nonetheless, the resemblance is so strong that he is detained and forced to defend himself against suspicion.
The episode reverses the balance of power. A man who normally scrutinises others is now examined as a suspect. His reputation cannot simply erase a witness's statement. Arkady eventually helps secure his release, but insists that Antonio proceed with caution. This is no longer merely the private investigation of stolen scientific files. Two apparently unrelated crimes have become entangled, and there is someone in the City who is either impersonating the detective or bears an uncanny resemblance to him.
Even this humiliation does not exhaust Antonio's problems. He experiences increasingly vivid dreams of the ocean, an aircraft, a beach and voices urging him not to abandon the investigation. The dreams are emotionally powerful and often feel indistinguishable from waking life. Antonio worries that his overworked mind is deceiving him, yet fragments of the visions correspond disturbingly well with evidence he has obtained during the day. He tries to rely on facts, precisely as a good detective should, while the ground beneath those facts continues to shift.
6. The phantom employee
At the GEO centre, Antonio questions its director, Mr Phoenix, and asks to see the personnel records relating to the missing employee. The file concerns a worker named Axel. The photograph becomes a decisive piece of evidence: when Nicholas presents it to someone familiar with the bank case, the man is identified as one of the robbers. GEO's vanished employee and the criminal gang are linked. The apparent boundary between the stolen archives and the attack on the bank collapses.
But an identified face is not necessarily an identified person. Antonio suspects that the name Axel may have been invented to obtain access to the geological material. He begins checking identities and following administrative traces backward. The path eventually leads to a children's home, where the history of several mice connected with the robbery can be investigated. What first seemed an impersonal scientific theft begins to acquire the contours of a shared childhood and a deliberate plan.
The visit to the children's home unsettles Antonio for reasons he cannot explain. The building itself provokes a sense of familiarity. Strange impressions intrude upon his thoughts even as he conducts the formal questioning expected of a professional investigator. The children's records bring him closer to the robbers, but they also awaken questions about his own earliest years. Antonio has always trusted his memory of the family in which he grew up. Now he must confront the possibility that parts of that history were carefully hidden rather than forgotten.
7. The name Victor Ness
Among the names connected with the criminal group, one demands Antonio's full attention: Victor Ness. A coincidence of surnames would not usually be enough to transform a police investigation into a family drama. Yet it comes after the bank witness's description, the strangely familiar orphanage and the recurring images of an unknown past. The detective begins to suspect that the resemblance has an explanation no database can provide on its own.
Other papers help him examine the lives of mice who spent time in the orphanage. Their connection to one another matters as much as their individual offences: the bank robbery is not a random outburst, and its participants have reasons to co-operate. Antonio studies their backgrounds and tries to understand how the theft at GEO could have fitted into their activities. The more information he obtains, the harder it becomes to separate criminal motives from the possibility of a private search for something lost years ago.
Antonio considers consulting his mother, the woman whose home, affection and guidance have always been central to his life. He delays, unwilling to believe that she may have concealed anything important. That reluctance is one of the novel's most revealing conflicts. His professional instincts urge him to test every assumption; his love for his mother makes him afraid to test this one. A detective who can face criminals without blinking is suddenly nervous about an ordinary conversation across a family table.
8. Threats and an inner life
Someone appears determined to discourage Antonio. An anonymous letter arrives with a direct demand that he abandon the case. His household assistant Polina is alarmed, as is Nicholas. There are also unsettling encounters on the road, including an attempt to corner the detective's car. What the City sees as another celebrated investigation has become dangerous for the person conducting it. Antonio does not immediately accept a police guard, preferring to preserve his freedom to think and move.
Dani returns with further old family documents, providing a counterweight to the threats. The letters from the world of geology give Antonio a glimpse of people whose hopes and fears preceded the present scandal. Their writers were not anonymous scientific names: they were members of an expedition expecting to achieve something important. They knew that the island might be difficult to reach and that the outcome could not be guaranteed. As the mystery develops, these distant voices begin to feel uncomfortably close to Antonio.
The novel also makes room for the private life the detective tries to keep secret. He thinks about Liza, the woman he loves, and the seaside where they met. His affection is sincere, but his work repeatedly interrupts the possibility of happiness. A wish to leave the City for a few days and spend time with her competes with his duty to the case. The contrast is important: Antonio knows how to pursue criminals, but is less certain how to protect the ordinary relationships for which that work should ultimately matter. Family, love and loyalty are no longer decorations around the mystery; they are its emotional centre.
9. The confession in his mother's garden
Antonio finally visits the mother who raised him. He brings flowers, expects tea and family warmth, and attempts to approach his troubling discovery almost casually. The familiar house and garden offer momentary relief from the City's dangers. But when he mentions Victor Ness, his mother's composure collapses. She cannot dismiss the name, and her tears reveal that the answer has been waiting for years.
Victor, she tells him, is Antonio's biological brother. Their parents were Alex and Sofia Ness, the geological researchers who vanished after their flight to Harry Island. The woman Antonio calls Mother was a friend of the missing couple. She took him into her care after the disaster, adopted him and gave him a secure home. She has loved him as her own child, but she concealed the story of the lost expedition and his brother's existence because she feared what might happen if the past returned.
The separation of the boys took place amid the confusion that followed the disappearance of their parents. Both children initially came under the protection of an orphanage. When Antonio became ill, he was taken for treatment to the hospital where his future adoptive mother worked. During that period Victor disappeared from the institution. A friend of the Ness family apparently took him away, although the details of the arrangement remained obscure. The mother suspects that a man called Zoltan, whose connection with the family she remembers, may have been involved. She had looked for information but eventually hesitated after warnings that this man could be dangerous.
Antonio is shocked, but he refuses to make his mother feel that her years of care have been erased by biology. She remains his mother. His anger is directed less at her adoption than at the secrecy that kept two brothers apart and left him ignorant of the fate of his real parents. The case has now become a test of whether his professional discipline can survive an intensely personal discovery.
10. The detective's own lost family
The revelation forces Antonio to rearrange the facts of the investigation. The resemblance noted by the bank witness is no longer supernatural or absurd. There really is another mouse with the family name, someone whose face may be taken for the detective's. A second puzzle also emerges: why would Victor involve himself in theft and deception while tracing a scientific expedition? What had he been told as a child, and what did his apparent guardian Zoltan teach him to believe?
Antonio's adoptive mother recalls how Alex and Sofia disappeared, the effort to place their sons safely, the uncertainty surrounding Victor's removal and the lengths to which she went to protect Antonio. Her account is not offered as a flawless justification. It is a confession shaped by love, fear and regret. The detective listens as a son as much as an investigator. For the first time he must accept that people may act dishonestly not from greed or malice, but because they are frightened for someone they love. That knowledge does not erase the hurt; it makes the moral problem harder.
She also provides an address associated with Zoltan in a troubled district of the City. Antonio intends to follow this clue, despite the risk. The apparent criminal and the respectable detective are now joined not simply by a surname but by their beginnings. Each has grown up with a different version of the same absence. One was protected by a loving adoptive mother; the other may have been raised in the shadow of an unresolved catastrophe. Their eventual meeting promises to be a confrontation between two understandings of loyalty, duty and truth.
11. A flight seen through another memory
As Antonio's mind struggles to process the discovery, the novel returns to the earlier expedition. The narrative does not present the twenty-year gap as an empty space. In vivid sequences, the reader follows the aircraft's descent and the desperate aftermath of its crash. Antonio's strange visions overlap with this older story, heightening the sense that the missing family history is somehow insisting upon being heard.
The pilots Richie and Yakov face the consequences of the emergency landing while the researchers are scattered amid wreckage and jungle. Alex wakes injured and disoriented, unsure who else has survived. His immediate concern is not scientific glory or the possible gold. He calls for Sofia and searches for her among the debris. His fear that she may have died dominates everything else. The expedition's grand ambition shrinks to the elemental need to find a loved one alive.
Alex eventually hears Sofia's voice and discovers that she is trapped beneath a heavy part of the aircraft. He cannot immediately free her, and her leg has been hurt. He must search for supplies and assistance while trying to reassure her. The couple's tenderness is inseparable from practical danger: without clean water, medicine, shelter and help, survival will be difficult. Beyond the broken aircraft lies an island with its own inhabitants and an order that the newcomers do not yet understand. The lost world the scientists came to study is anything but an empty research site.
12. Ptero and the rulers of Harry Island
Alex meets Ptero, a flying squirrel whose rapid movements and unusual way of speaking initially bewilder him. Her appearance turns a frightening, isolated landscape into a place where communication and alliance may be possible. Ptero knows the paths through the jungle and has information about the island's rulers. She says that other visitors from the City have appeared here before. The suggestion contradicts the researchers' assumption that they were entering a territory unknown to outsiders.
The rulers are powerful leopards who inspire fear among the island's inhabitants. They have taken objects from the wrecked aircraft, and their control of the territory makes searching for the missing expedition members more dangerous. With Ptero's help, Alex tries to gather necessities and protect Sofia. Yakov also becomes part of the struggle to organise the survivors. Their priorities change by the hour: first the wounded, then a safe refuge, then supplies, then a means to find or rescue those still missing.
A dangerous journey takes the survivors through the island's interior and toward places connected with the rulers' possessions. They encounter remarkable obstacles, including a treacherous stone bridge whose design makes a careless step potentially fatal. What lies beyond is not simply a cave of fabulous treasures, but a hoard of things taken from earlier visitors and expeditions. For Alex, these objects are valuable chiefly because they may help the survivors live and escape. The very contrast between their use and the rulers' desire to control them speaks to the novel's conflict between discovery and possession.
13. The secret of the golden island
The explorers gradually realise that gold is not merely a rumour attached to the island's name. It has helped draw outsiders to a place they scarcely understand. The rulers, too, have a history that begins beyond the island. When Alex overhears them speaking in the familiar language of the City, the revelation is deeply disturbing. They are not mysterious creatures untouched by the outside world. They know its speech and customs because they once belonged to it.
Captured and separated from his companions, Alex hears the rulers discuss the newcomers and their purpose. Their words suggest that the present expedition is repeating an earlier one. The island's supposed isolation has allowed past visitors to become masters over those who lived there before them. The claim to power rests on fear, unfamiliar knowledge and the exploitation of the inhabitants' limited understanding of the visitors' technology. The scientists who originally sought knowledge and wealth have turned their stranded existence into domination.
This discovery changes Alex's response to the leopards. They are no longer simply formidable animals capable of overpowering him. They are representatives of a distorted version of the same world from which he came. Their authority raises an uncomfortable question: does scientific knowledge make one wiser, or can it become a convenient tool for oppression? Alex's immediate aim is still to save Sofia and his friends, but he now understands that escape may require him to challenge a political order established long before his plane arrived.
14. Fire, fear and the power of a signal
Ptero helps Alex escape and points him toward an island festival called Fire Day, when the rulers display their authority before the inhabitants. Alex has found a signal flare among the recovered emergency equipment. To a visitor from the City it is a practical tool for attracting attention. To islanders unfamiliar with such devices, its sudden light and force can seem extraordinary. Alex recognises a possibility for confronting those who hold his companions captive.
The confrontation is dangerous rather than effortless. The leopards have strength, followers and the advantage of long-established power. Alex must stand before them while the fate of Sofia and the remaining expedition members is uncertain. He uses the flare to demonstrate a power that the rulers do not possess in that moment. The spectacle shakes the islanders' belief in the invincibility of their masters. Ptero helps him understand the crowd, and the crowd begins to see the rulers as beings who can be resisted.
The leopard leaders themselves reveal that they were once scientists who reached the island on an earlier expedition and remained after an aircraft crash. Their supposedly mysterious authority is therefore founded on an ordinary, if tragic, human-like history. When the crowd turns against them, they flee. Alex is acclaimed as a new ruler, even calling himself a master of lightning in the excitement. Yet the victory has a morally ambiguous edge: he has defeated deception partly by using the same awe of unfamiliar knowledge. The story invites readers to question what kind of responsibility comes with such power.
15. Two brothers, two ideas of justice
The story returns to Antonio in the present. He is no longer simply following a trail of bank robbers. He is trying to understand how the missing expedition shaped the lives of two children. Following clues that have led him toward Victor, he enters an apartment that appears recently occupied. A warm cup and the arrangement of the rooms suggest that someone has left only moments earlier. Books about vanished expeditions make the connection to Harry Island still clearer.
Antonio finally encounters Victor. He does not approach him as a faceless offender. He tells him about their shared parents, Alex and Sofia, and explains that the woman who raised Antonio had known them. The disclosure unsettles Victor. For years he has been told that his parents survived and that finding them must be his life's purpose. Zoltan's influence lies behind this conviction and the choices Victor has made. To Antonio, a long disappearance is strong reason to fear that his parents are dead. To Victor, it is the very reason he must refuse to stop searching.
The detective urges his brother to surrender and face the law. He also wants to protect those around Victor and prevent further harm. Victor refuses. He has accumulated documents, found information about the island, secured money and an aircraft, and even learned to fly because he is determined to reach the place where their parents vanished. His search may be reckless and his methods criminal, but the emotion driving him is recognisably the same love and loss that have shaken Antonio.
16. The mystery remains alive
The book does not conclude with a conventional arrest, a miraculous rescue or a definitive declaration that every character has been accounted for. Instead, it brings the brothers face to face at the point where their principles collide. Antonio believes that duty, evidence and the law must matter even when the person in question is his own brother. Victor believes that the chance of finding his parents is worth the risks and that surrender would mean abandoning them. Neither position can be reduced to a simple slogan without losing the emotional tension of the story.
The island's past now illuminates the present crime. The stolen geological information is relevant because Victor is planning a journey, not merely seeking profit from confidential documents. Money, maps and technical preparation are part of his attempt to reach the vanished expedition. The bank crime and the research-centre theft are bound together by this obsessive private mission. Antonio has uncovered the reason for the connection, but understanding a motive does not absolve the acts committed in its name.
The central intrigue therefore remains active. Did Alex, Sofia and the others survive beyond the events shown on the island? Can Victor reach a place long concealed by natural anomalies and dangerous inhabitants? Can Antonio save his brother from both the law and his own determination, without betraying the values by which he lives? The final confrontation does not answer those questions for the reader. Instead, it opens a deeper chapter in the two brothers' lives. What began as a detective's investigation of stolen papers becomes a story about family, the cost of secrets, the temptation of power and the stubbornness of hope. Harry Island is not simply a point on a map: it is the place where the lost past and the unfinished future meet.