A missing child. A desperate father. A monster with a terrible secret. Guido T. has already confessed to two horrific child murders and led the Berlin police to the horribly disfigured bodies. The police are sure he is also the kidnapper and murderer of six-year-old Max, who disappeared without trace a year ago. But now Guido T., who is being held in the high-security ward of a psychiatric prison hospital, is staying silent. The investigators have no reliable evidence. And without the prisoner's statement, Max's parents will have no certainty and will never be able to say goodbye to their son. One day, an investigator from the homicide commission makes Max's desperate father an unbelievable offer: he will smuggle the distraught parent into the hospital where Guido T. is imprisoned. Max's father will be listed as a fake patient, equipped with a fake medical record. He will be as close as he possibly can to the child killer, and plans to force the killer into a confession. Because nothing is worse than uncertainty. Or so he thinks. Until he, as an inmate, learns the gruesome truth...