Two art thieves have stolen the famous "Black Square" of Russian painter Kasimir Malevich. They plan to meet their clients on a cruise ship to hand over the looted art. However, things are not going quite as planned..
For the sake of the family, Vyacheslav Lazarev left the big aviation. The usual routine of Lazarev and his son Kolya is disrupted by a small bear cub, huddled in the cockpit of one of the planes. Little Mansur - as Lazarev and the others called him - having escaped from poachers, becomes attached to Lazarev.