According to the story of the same name by Aleksandr Avdeenko. The end of the 50s. Transcarpathia. Two saboteurs cross the border near Tissa. One dies during detention, and the second, under the guise of a front-line soldier Ivan Belograi, appears at the state farm and begins to look after Theresa, whom he met by correspondence. Frontier guard Andrei Smolyarchuk, in love with Theresa, is the first to suspect a spy and is trying to find out what his purpose is...

An officer accidentally leaks information about the first test of a new aircraft model. When spies get hold of this classified information, the development of the new airplane is under threat.

The secretary of the district committee Borzov, trying to fulfill the plan, does not care about the rise of the entire economy. The second secretary of the district committee Martynov does not agree with his methods of work...