Old Odessa. After serving a year in jail for disorderly conduct, Andrei returns to the shipyard and begins an honest working life. But his biography becomes the bait for the thief and the recidivist Greni, who has been working in these parts for many years. Soon, friends and beloved Andrei`s girl find out that he was detained by police and suspected of theft. The case is being investigated by the criminal investigator Brytsov, and his sympathy is clearly on the side of the youth. Step by step, Braitsev unravels the complex tangle of clues and guesses that lead him to the famous fraudster Gren.