The Russian detective series "Cipher-3" revolves around the newlyweds, the Vershinins. Sonia and her husband arrive at the location where their apartment will be. Meanwhile, workers in the boiler room of a barracks, which is scheduled for demolition, discover the body of a woman. Vershinin calls for backup. In Protasov's house, someone has blown up a safe. Proskurin finds out that the evidence leads to a robber known as "Dark". Ira and Zoya learn that Artemyeva left her home during the blockade.