A screen version of a novel of the same title by Veniamin Kaverin.
Sanya Grigoryev, a teenage boy from the town of Ensk, comes across a dead postman's bag containing a package of letters recounting the tragic end of Captain Tatarinov's Arctic expedition. He goes to Leningrad and enters the school where Katya, the Arctic explorer's daughter, is a student, telling her about the letters. The love for Katya and the letters of her father are behind Sanya's firm decision to become an Arctic pilot and find the trace of the vanished expedition.
The war-time hardships, the treachery of a school friend and the slander of Captain Tatarinov's brother who had destroyed the expedition complicate the search which Sanya relentlessly pursues.
The film was awarded the Diploma for the Film Director’s Work at the International Children Film Festival in Belgrade, Yugoslavia (1956).
Source : www.lenfilm.ru