A story about high school students whose holidays were overshadowed by the outbreak of war. Enrolling in the militia, they not only staunchly assist the Soviet troops in the rear, but are also ready to defend their native city with weapons in their hands.

According to the story of the same name by Yulian Semyonov. Employees of the Moscow Criminal Investigation Department - Colonel Alexei Pavlovich Sadchikov, Major Vladislav Nikolaevich Kostenko and Senior Lieutenant Valentin Roslyakov are investigating the impudent robberies carried out by a group wearing dark glasses criminals. The City Savings Bank was robbed. The investigation of the crime indicated the involvement of a teenager, who soon came to the criminal investigation himself. With his help, the robbers who were preparing the next raid were caught. But the most dangerous criminal — "Prokhor" — is still free...