The series is a continuation of the war drama film "Translation from German". The events take place at the end of 1941. Nazi special agents are trying to infiltrate the territory of the Soviet Union. In an attempt to defend against them, NKVD officers embark on a secret operation. Educator Irina Voskresenskaya and Major Pavel Nechai must pretend to be a married couple in order to gain the trust of Moscow monarchists. Together, they are tasked with organizing the secret society "Operation Prestol".