Under the cover of a large crowd, a stabber kills two people in Hanover. The supra-regional investigation team, which includes the two chief detectives Thorsten Falke and Anaïs Schmitz, is faced with a difficult task: there is no trace of the killer – and there is a risk that he will act again. In order to gain possible clues, they decide to use the innovative KROISOS software. After a comprehensive data analysis, the program quickly presents a probable suspect: the mentally ill René Kowalski. However, his sister Nora believes it is impossible that her brother is the killer. Falke also remains skeptical. Then another crime happens that is almost identical to the first and overturns all certainties…
