Through a misunderstanding, the young militiaman Vasya Shaneshkin detains and brings to the precinct Vodnev, employed as cashier at a construction trust. His daughter Katya, a University co-student of Shaneshkin's, doesn't dare tell her father that she favours Vasya. At the same time, the swindler Zaitsev, winning Vodnev's confidence, relieves him of a significant amount of money. Displaying resourcefulness and courage, Shaneshkin seizes the criminal.