1986, Moscow region. A mutilated body of a child is found in the area of government dachas. Three investigators take on a case that will change each of them forever.

The next victim of the maniac becomes a teenager from a local pioneer camp, and the only witness again turns out to be ten-year-old Igor Maltsev.

The main suspect escapes from the investigators, and another child disappears in the area.

Suspect Makurin has been caught, but investigators are waiting for a new terrible find. Meanwhile, Zhenya Bokova is getting worse, and Igor Maltsev's father decides to publish a devastating article about the investigation.

The group detains librarian Dmitry Laval, but they lack direct evidence.

The mystery of Igor Maltsev has been solved, the Fischer case continues to destroy the lives of its leading investigators, and another tragedy occurs at a stable near Moscow.

1992. Three children go to the slot machine club and do not return home. Bokov, Kozyrev and Dobrovolskaya will have to face the Fischer case again.

While Dobrovolskaya and one of the teenagers are imprisoned in Fischer's basement, Bokov and Kozyrev go after the killer.