Moscow, summer 1953 in a house not far from Lubyanka. This is where Tania, an 11-year-old girl who does not go to summer camp, lives. In this house returns from a distant exile to Magadan the family of the little boy Mitia. Mitia tells Tania that her dog, Hector, stayed there in Magadan. The children are doing their utmost to bring Hector back to Moscow, and looking for ways to get there Tania discovers the secrets of Mitia's family of which he has no idea.