Friends serve in the same military unit - commanders of tank battalions, majors Oleg Sedov, Vladimir Likhachev, Ivan Zverko. During a training exercise, Sedov makes a risky decision to break through the swamp. His battalion manages to be the first to occupy the height, but Likhachev’s battalion is only ten minutes behind the first battalion, but at the same time Likhachev, as always, remains cautious and does not agree to the risky proposal to go through the swamp. Sedov pays severely for his recklessness. One of his battalion's tanks overturns and falls into the swamp...

Bored without friends, seven-year-old Olezhka wrote a letter to the newspaper asking them to send him tin soldiers. And then seven real soldiers appeared in the village. However, they were called quite fabulously: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.

One of the southern cities of Russia during the NEP. The famous doctor and his wife are killed, the person living opposite Schwartz is kidnapped. The bandits were looking for gold. Then there is a diversion at the factory. The Chekists find out that a man is implicated in everything, posing as a businessman Bespaly, he is Lieutenant Voronov, aka “Chaly” - the leader of the gang. With the selfless efforts of the operatives, the gang manages to neutralize.