While investigating a murder the police captain discovers a relation with the events of a medieval times...
Wartime, summer 1941. Train carrying criminals gets under enemy fire and crashed. Out of all of the living are only a young lieutenant of the NKVD and two prisoners - the thief and repressed Communist party worker.
Two friends are army officers, and the turbulent times throw them from the Civil War in the early 20s to the Soviet conflict in Finland, from China to the Urals.
