Bilbao is in a panic. There's a serial killer in town. H9 kills with brutality and each time leaves behind not only a corpse, but also a clue to long-forgotten, unsolved cases. It seems that H9 is intentionally helping the police by eliminating those who, in his opinion, should be dead. Inspector Ander Crespo from Erzinca finds himself embroiled in a nightmarish game in which a maniac leads him by the hand to the truth. But what price will you have to pay for this help? And how are the victims of H9 related to the missing girls?As Bilbao plunges into darkness, Ander has to realize that in order to catch H9, he will have to face a terrifying past. . A bright debut from the Basque Country! A bestseller in the genre of psychological thriller. - The launch of a new series "Profilers" about analysts who solve the most hopeless criminal cases. The observation of such specialists allows them to "read" the real criminals by the smallest details of their appearance. - The book takes place in Bilbao, where Inspector Ander Crespo investigates a series of brutal murders (the killer's signature is the mysterious "H9"), finding out the connection with the disappearances of girls in the 1990s and a personal tragedy from his past. - Even discerning fans of Pierre Lemaitre, Eva Garcia, Saenz de Urturi and Carmen Mola will appreciate this story, finding everything they love.