The Soviet boys, Vadik and Yura, together with the mischievous little girl Tosha, are children with a kind heart and good life philosophy. One day they find money on the street, which must be returned to the owner without fail. But where to find an inattentive citizen who has lost not only money, but also a booklet with quite important information. So, begins the time of exciting adventures, breathtaking moments, high-quality humor and instructive-entertaining ideological line.

It is May 1912. Thirteen political prisoners are being tried in a naval fortress of Kronstadt. They are sentenced to death by hanging. A clandestine Bolshevik organization decides to free the prisoners during their transfer to the place of execution. Vasily Panin, a junker of a school of naval engineers, is one of those entrusted with this dangerous task.

Tenth grader Olya Ryzhkova can't find understanding among the people around her.

Two curious first-graders decide to steal a turtle named Rocket from a living corner to conduct a risky experiment — they want to put it under the tank in order to check the carrying capacity and strength of the shell. But their classmate Tanya is smarter than her friends: with the help of adults, she manages to organize the rescue of the unfortunate turtle.