The director of the elite school Ageev is killed near the garbage chute with a shot in the back of the head. After talking to the Ageyevs' neighbors, Emelya begins to suspect his widow. Ageeva had a lover, she was going to divorce her husband...

One of the guests, Gorokhov, was killed at the corporate party of the Paradise in a Hut company. Shortly before that, he quarreled with a colleague Suchkov, on whom suspicion falls, especially since Suchkov has a gun...Emelya is talking to Gorokhov's wife and notices bruises on her. After following the woman, he and Vasin see her meeting with her lover...

College teacher Anna Roshchina dies after eating a watermelon. Likhacheva finds a potent poison in a watermelon. Checking the store where it was bought does not give anything: the rest of the watermelons are without poison. The investigation leads the operas to Anna's lover...