Jonas is in his mid-twenties, still lives with his parents and gets dumped by his girlfriend. He soon gets to know Lena, a tough young woman with ideals, and immediately falls in love with her. However, to prove he is worthy of her love, he has to pass an endurance test.

This children's adventure movie is a charming tale of a group of youngsters in Prague who hear that Soviet sailors abandoned their failing ship in the Arctic Sea before it went down, but no one had been able to find the sailors yet. Inspired by the efforts to save the men, the youngsters strike out on their own to help in the rescue attempt.