A story about CHeKa operation against a foreign spies during the early years of Soviet Russia.

Leonid Pleshcheyev returned from the war blind. Against his will, he became a dependent. He drowns his grief in unrestrained drunkenness, thereby tormenting his wife Mariya and his teenage son Lyonka. Mariya finally decides to take her son and leave for Altai, but the boy runs away and returns to his father. So, together, they eke out a half-miserable existence until Grigoriy Shalagin, Pleshcheyev's longtime friend, returns from the army. It is he who awakens in Leonid the extinct self-esteem and pride of a soldier. Pity aside, he helps him get back to work.

Chief accountant Porfiry Petrovich Smirnov-Alyansky, who took a good walk on the anniversary of his colleague cashier Ivan Zakharovich Vodnev, climbs into the traffic controller's booth and disrupts traffic on one of the streets of Leningrad. However, the guard Vasiliy Shaneshkin mistakenly delivers to the police station not an escaped offender, but a quite decent cashier. In addition, Vodnev, offended by the police, turns out to be the father of the bride Shaneshkin — Katya. Vasiliy admits his guilt, but, not daring to explain himself, leaves the angry Ivan Zakharovich with bad thoughts about the Soviet police. Fortunately, the young sergeant will soon have an opportunity to prove to others the responsibility and conscientiousness of the police officers.