A second dead woman is found. What's more, another woman was attacked nearby that same evening, and survived the attack only by chance. It's clear to Markovič that a dangerous serial killer is on the loose in Prague, and he finds himself under increasing pressure from the StB. He believes it's a juvenile sexual aggressor, but his friend Dr. Řemen disagrees. It would be a great rarity.

With the discovery of another dead woman, fear of an unknown strangler begins to spread throughout the city. Jiří Markovič has to submit regular reports to the StB general, and it seems that the detectives are just overstepping their bounds. Fortunately, they discover a seemingly unrelated assault case that may be key to the investigation.

Straka is finally caught and Jiří Markovič faces 24 hours of intense police work. Under the supervision of the StB, the investigators must question not only Jiří Straka but also his parents. They are under time pressure and cannot make any mistakes.