One morning, the residents of a nine-story building discover that their elevator is missing. Nadezhda Nosova, a housewife and mother of two sons, is taking over the investigation. The younger Artyom is forced to help her, but the deeper they dive into the case, the more they learn about neighborhood secrets, encounter intrigues and mysteries that unexpectedly lead to the main suspect, Nadia's eldest son Denis. Now solving a crime becomes a matter of honor.