Masha is going on a summer trip in a motor home with her dad. Three years ago mom and dad promised their daughter that they would spend more time together and now a trip to the countryside is a family tradition. But Masha has already grown up, and it became boring for her to spend so much time with her parents. The teenager's soul is bursting for new adventures, but the adults do not understand it at all. One of the stops on the way of the family becomes a campground. There also stops the bus, which takes teenagers to summer camp. Masha gets acquainted with one of the girls. As luck would have it, her name is also Masha, and she doesn't want to go to camp at all. Not thinking long, the girls switch places: Masha goes to the camp, and the "other Masha" quietly returns home. At the camp Masha meets her "old" acquaintances - the crooks Hakhal and Nyanya, who are again up to no good. Masha and her new girlfriend Vika decide to fight back and develop a cunning plan with sophisticated traps to prevent the villains from carrying out their plans.