1826, St. Petersburg. After the suppression of speeches on the Senate Square, the investigative commission begins searching for the Decembrists. Some of them are caught by the authorities because of informers. Suddenly, a series of brutal murders takes place in St. Petersburg: the victims are those who denounced the Decembrists. A piece of paper with lines from a poem by the young poet Alexander Pushkin invariably remains near the bodies of the dead. A Moscow detective and a nobleman released from arrest, Alexander Boshnyak, are taking over the investigation of the case.

The picture tells about the feat of Russian scientists who are sent to Svalbard as part of the Russian-Swedish expedition in order to measure the actual size and shape of the globe.

The fathers of two teenagers from wealthy families — on a bet who will break down first — send them to a secret camp where quests with a special forces theme are held. Faced with the first difficulties and imminent social conflicts, one of the guys asks to take him home. However, on the eve of leaving the camp, the youngest pupil disappears. All quests are canceled and the most prepared children are asked to help with the search. Children become unwitting witnesses of a crime and fall into the hands of bandits. With a series of adventures, mutual help and revenue, young people are trying to find their way home and escape from danger, because everything did not go according to plan.