Alexey Severtsev, who came to enroll at Leningrad University from Siberia, is cleverly deceived by experienced criminals. At the station, they manage to lure Severtsev into a deserted place, beat him and rob him. A young police sergeant Nikolai Zakharov is assigned to investigate this incident. Zakharov will show resourcefulness and courage, and, of course, will detain repeat offenders.

Peter married and was immediately appointed captain of the ship. In his first flight, the hero went with his wife — really wanted to introduce her to her mother. But mother offended on him…