Psychiatrist Anna Zhuk, who suspects her patient Galina Solovyova of bullying her one-year-old daughter Tanya, turns to the Sedykh department with a statement. After talking with Solovyova's neighbors, Bobrova and Pankratov, to their surprise, learn that Zhuk and Solovyova are one and the same person. Soon the investigators manage to detain Solovyova in the park.

An abandoned baby was found in the park with a note indicating the abduction of his mother. Soon, investigators manage to find the husband of the missing. It turns out to be the famous writer and author of detective stories Anna Simovskaya. Following the clues transmitted by the mysterious attacker in numerous notes, Bobrova and Seleznyov find the apartment where he kept his victim.