The young girl Olga Vasilyeva grew up in an orphanage. She never knew her mother and wants to find her. The only trace she has is a preserved letter from her mother from her personal file, which she managed to get from the administration of the orphanage. For a short vacation at her factory school, she travels from Sverdlovsk to Moscow following the unreliable traces of this letter. Yelena Alekseyevna — the woman she finds when she arrives at the address turns out to be a teacher in a ballet sc...