Yevgenia Pankrashina, the wife of a wealthy businessman, was killed with two stab wounds in the stairwell of a Moscow high-rise building. According to her relatives, the victim had an expensive piece of jewelry with her - a bib necklace. However, he was not found at the crime scene. At first glance, everything is simple - murder for the purpose of robbery. But the more information about the identity of the murdered man manages to collect operatives - Anton Stashis and Roman Dzyuba - the more mysterious and strange this case becomes. And then there is the death of a person close to them, which continued a series of unexplained murders ...