A man's corpse is found on the seashore. Conducting a thorough investigation, the young investigator Kovalev establishes the identity of the murdered man and his pursuer - in the past a provocateur, who gave the Hitlerites a group of underground fighters. At one of the interrogations the criminal recognizes in the prosecutor Skurchikhin former SS Oberleutnant and begins to blackmail him, not suspecting that he worked for the Soviet intelligence...