The events of the film take place in the early sixties of the XX century, when the exploration of Antarctica was just beginning and the ice continent was full of secrets and mysteries. A group of polar explorers, before being sent to their homeland, is given the task of re-preserving the Vostok intracontinental station.

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...

A locker room janitor at the train station notices that a suitcase was put in a locker by a man, but pulled out by another man. This suitcase appeared to be stuffed with money. This incident allows a police detective to uncover a huge criminal organization responsible for theft, smuggling and murder.