Markus returns home to care for his daughter when his wife dies in a tragic train accident. However, when a survivor of the wreck surfaces and claims foul play, Markus suspects his wife was murdered and embarks on a mission to find those responsible.
At a grisly murder scene sits a figurine made of chestnuts. From this creepy clue, two detectives hunt a killer linked to a politician's missing child.
Detective Katrine Ries Jensen and legal psychiatrist Thomas Schaeffer form a special unit at the Copenhagen Police investigating serial killings. A case from Schaeffer’s past crops up. As a young psychologist, he held back from sending a patient, who was manically drawing the details of a traffic accident, to a secure hospital. Now these bloody scenes resurface, enacted as real killings.
