October 1981. A dead woman is found near the Motol stream. The Prague "murder squad" led by Jiří Markovič suspects that they are dealing with a sexual deviant. No one suspects that this is the beginning of an investigation into one of the most famous Czechoslovak serial killers.

Jiří Markovič meets Ladislav Hojer face to face for the first time. Could a screaming boy who looks like he can't count to five be responsible for the murder? And how come he acted so expertly in his first murder?

Ladislav Hojer becomes increasingly close to investigator Jiří Markovič and confesses to another murder, this time in Brno. The investigators do not believe him at first, but horrific details gradually come to light that shock everyone.

The endless investigation begins to affect the otherwise peaceful family life of Major Markovič. To please Ladislav Hojer, he confesses to another murder. This time on a train from Prague to Děčín. A detailed reconstruction is needed.

Jiří Markovič receives an unexpected gift from Ladislav Hojer for Christmas. A confession to two more murders. In Slovakia, near the Ružín dam and on the Děčín embankment. Jiří Markovič receives a clear order from the management - to complete the investigation of these two murders and close the entire case.

Jiří Markovič does not want to accept that he has to close the whole case because he has another confession from Ladislav Hojer. But the order from the management was clear. And Ladislav Hojer is waiting for the wooden sleeping bag that he saw in a dream.