In July 1941, the advancing German army intercepted a car carrying jewelry. German intelligence leadership decided to replace the dead collector with a secret agent. In August 1942, the family of the jeweler Ivanovskiy was murdered. A team of the Moscow Criminal Investigation Department led by an experienced security officer Danilov started its operation to neutralize dangerous criminals, which were trained in schools of SD and Abwehr to conduct sabotage activities. The former thief Kostrov was assigned to capture enemy agents.