Elena Maksimova contacts the detective agency. After the banquet, she woke up in bed with a guy she barely knew. And now she's being blackmailed. Who does this and why? Miroslava advises Elena to tell her husband everything, but the client is afraid that her husband will not believe her. Agency employees are taking up the investigation of this case. But after the name of the blackmailer is established, she is killed and Maksimova is accused of the crime. She is about to be formally charged with murder. Detectives find out that the killer is someone whom Elena could not suspect under any circumstances.