A special train from St. Petersburg to Moscow. General Khrapov is stabbed in his compartment. A mysterious "BG" mark was found on the handle of the bloody blade - the sign of an elusive terrorist group. Only Fandorin can neutralize it. Prince Pozharsky, who is also investigating the case, stands in his way. A deadly duel begins.

1941. The start of Great Patriotic War. The country mobilizes all resources and Alexander Mazover (Doberman) is charged with creating a K9 suicide squad. He has to train dogs to run to the enemy tanks and blow them up but from the beginning, things don’t go as planned. Doberman gets in trouble with his commanding officer. Things pile up in a big mess until Alexander meets Julbars and his beautiful handler, Dina. He learns that this dog successfully blew up German tanks without being killed. Doberman takes Julbars and uses him as an example for other K9 soldiers, developing a behavioral pattern that saves many dogs lives.

The year is 1967. A series of mysterious murders of women are taking place in Leningrad. An experienced KGB major, Chuzhbin, and a police captain, Fedorov, are assigned to catch a maniac who leaves mysterious signs next to the victims.

The year is 1953. Due to the mass amnesty, the criminal situation in the USSR is tense. At the same time, Ivan Astafyev, a former commander of a reconnaissance platoon, who was released from prison, returns to his hometown of Gorky. And immediately becomes a victim of an attack by bandits, and then a false accusation of beating the attackers. Ivan's pre—war acquaintance, Captain Shvedov, helps out of trouble, who gets him a job at the Dynamo sports society to train policemen in hand-to-hand combat.