Lieutenant Colonel Vershinin enters the course of affairs in a new place, gets acquainted with his deputy Knyazev and faces the first problems. He goes to the sealed house of Avdeev in the hope of finding information there that will shed light on the circumstances of his death, and meets Anna there. She notices that there are not enough things in the house. Their conversation is interrupted by the watchful outfit of the teaching staff ... Vershinin learns that the children from the orphanage are taken to the dolphinarium under suspicious circumstances. Trying to figure this out, he calls the children's ombudsman Korovin to himself, but runs into sharp resistance from the mayor Bachurin.