The story of a man who routinely dodges all responsibility, bemoans fate, spends his days boozing, and refuses to work. The act of playing long-lost father to a pretty teenager spurs him to turn over a new leaf.

Shurik, a kind but naïve ethnography student, falls in love with the intelligent, athletic and beautiful All-Union Leninist Young Communist League member Nina. He has a rival in the wealthy comrade Saakhov, who concocts a kidnapping scheme to force Nina to marry him.

A diamond smuggling operation goes wrong when an ordinary Soviet citizen becomes unwittingly involved, and the criminals are forced to court him to retrieve their diamonds.