The film's plot is based on the real murder of the Soviet diplomatic courier Theodor Nette abroad. The pouch of the Soviet diplomat, which is stolen by British spies, is taken away by the sailors of a ship sailing to Leningrad who deliver it to the authorities. The intelligence agents make every effort to retrieve the bag.
Set in Odesa at the end of the Civil War when the town is occupied by the Whites. The night coachman, fifty-year-old Hordiy Yaroshchuk, lives with his daughter Katya who gets involved with a Bolshevik and revolutionary.
