The action takes place in 1935 at a polar scientific c station at Wrangel Island, the outpost of the USSR Far North. Inspector Nikolai Zherdev comes there to investigate the tragic death of doctor Wolfson. He wants to settle everything quickly and as soon as possible return to mainland to his beloved wife. But on arrival he realizes that the case is rather complicated. Risking his carrier and despite of authorities’ orders he starts the enquiry.