A young guy decides to try himself in a northern region of USSR after being honorably discharged from Soviet Army.

The events take place in Russia in 1917. A former peasant, and now a soldier, Ivan Shadrin, was sent by fellow soldiers from the German front to revolutionary Petrograd to hand Lenin a letter with questions from his comrades.

Eugene returned from the army, and his friend Kostya Sila — from the penal colony. Having met, heroes decided to leave the city: one didn't wait for the beloved girl, another doesn't want to see sympathetic views of former acquaintances. But the meeting with the police major — a talented teacher — changed their intent. All summer heroes devoted to wrest from the influence of the bully the group of boys.