Alyona comes to Fedya and finds him in a bad mood - usually Mom comes on Wednesdays, but now they finally quarreled because of Alyona. Alyona offers to make peace with her mother, especially since the quarrel was partly her fault, and drags Fedya to her mother's dacha.

In Alyona's apartment, the ceiling is flooded. Alyona goes to investigate, asks for help from Fedya. Fedya can't help anything - you need to get to the roof, but there's a lock hanging there, the locksmith doesn't have a key, you need to cut it down. Alyona calls Serega for help.

In the morning, the district policeman Myshkin comes to Fedya. He says that Fedya has such a job that can help fight crime - your cleaners come to the apartment, and there's something suspicious, well, you call me right away.