Arkadi Pinchuk

Fighter pilot Nikolai Muravyov is experiencing a personal drama: his wife and son left for the mainland - they are tired of life beyond the Arctic Circle. Colonel Belyy, thinking that his wife will return to her husband if he serves on the mainland, sends Nikolai on a business trip. In the new unit, Muravyov meets his fellow student Yevgeni Shelest. Friends have to fly in pairs.

In the vicinity of the river port, the boys discovered a warehouse of German ammunition, preserved from the Second World War. To save the city from an accidental explosion, a detachment of sapper soldiers was involved in the case.