Enraged, a teacher murders a young female pupil. Over the years, another boy is bred for one sole purpose: to avenge his sister’s death.

The film is a recollection of an adult about the unforgettable days of the first post-war year. Klava, who lost her husband at the front, with her 12-year-old daughter Lyusya sheltered Aygul with a seven-year-old boy in her house. Aygul's son - the main character, now became a pilot, recalls his childhood in a small Kazakh city, which fell on a difficult post-war time. Flying high above the Earth, he thinks of the Russian girl Lyusya, from his distant past.