Excellent gunner, Corporal Vasily Kochetkov, meets Valya Gradskaya, a saleswoman of the military organization, and becomes a frequent guest in her family. The young man does not know that she and her "hospital grandmother" are agents of the enemy who want to discover a military secret from the soldier. Remembering the oath, Kochetkov informs the command about the suspicious actions of his new "friends" and is given a secret task - to continue playing the role of the groom. After successfully executing the commander's order, the hunter helps uncover foreign intelligence agents.
