Laima Skalbe, commander of group "U" of a special-security service that performs missions of the highest secrecy, decided to put an end to her life full of danger and adventures and get married. A young, handsome, well-off man proposed to her—and she said yes. But an agent can’t just simply get out of the game! The fearless commander of group "U" was literally snatched from her wedding to be assigned a new mission. Laima, along with her loyal assistants—former paratrooper Ivan Medved and a network guru Evgeniy Korneev—are sent to the city of Chistoretsk, where a festival of folk music is being held. Under the guise of guests, terrorists are supposed to arrive—ones interested in three scientists working on a secret project at the nanotechnology institute. For the sake of deep cover, the fighters of group "U" decide to become participants in an international music contest and turn into the folk ensemble "Cheerful Matryoshkas"…