A young maid is murdered in a small hotel. Katya was strangled in the room of the guest, Denis Dolgov, with the belt from a bathrobe while he was in the shower. Because of the noise of the water, Denis heard nothing. The young man is arrested. His parents hire Tatyana Ivanova—the best private detective in the city. Tatyana is immediately perplexed that no alibis were checked for either the guests or their visitors or the service staff. But why would they? The killer, you could say, has already been found. By the way—does the bereaved fiancé of the murdered girl have an alibi, one who stubbornly refuses to meet Tania and help with the investigation? Four days later, a car knocks down another maid from the same shift, and the famous detective completely changes the course of the investigation…