For the first time, the Ivanovs undertake to solve a murder that has not yet happened - at the reception, Darina sees that the son of Vera Konstantinovna, a new client, is facing death. Together they try to prevent a crime and find a potential killer. Meanwhile, in the house of the Ivanovs themselves, Tamara Petrovna is also trying to prevent a crime - Valera's betrayal. She is sure that the son-in-law has found someone on the side and is going to leave with a new chosen one on a romantic trip...