Businessman I.V. was killed in his house. Litvinov. Litvinov’s nephew Artur Avilov was detained on suspicion of murder. However, Avilov himself claims that he did not kill Litvinov. Avilov’s wife turns to private detective N.F. for help. Trubnikov, who is shocked by the behavior of the relatives of the deceased. They care little about Litvinov's death, are they concerned about who will get the inheritance? They do not know what surprise awaits them after inheriting.