After news of the future birth of a child, Sergei split from his wife, Natasha, and settled in the company of young architects, who occupied a room in a big house. As a result of a chain of unforeseen events, brought by one of the tenants found a child, Sergei finds a newborn son. Friends are doing everything possible to find a lost mother, but Sergei does not disclose their affiliation and tries to give the baby the wrong hands.

Based on the true story of Russian pilot Valeri Chkalov (1904 - 1938), who set several long-distance flight records. Chkalov and co-pilots Baidukov and Belyakov altogether had accomplished several nonstop long-distance flights. In June 1937, Chkalov set the world record, covering 12,000 kilometers in 63 hours of nonstop flight from Moscow to Vancouver, Washington, flying over the North Pole.