Masha goes on a summer trip with her dad in a camper. Three years ago, mom and dad promised their daughter that they would spend more time together, and now a trip to nature is a family tradition. But Masha has already grown up, and she has become bored of spending so much time with her parents. The soul of a teenager is eager for new adventures, but adults do not understand this at all. One of the stops on the family's route is a campsite. A bus that takes teenagers to a summer camp also stops there. Masha meets one of the girls. By a lucky coincidence, her name is also Masha, and she doesn't want to go to camp at all. Without thinking twice, the girls switch places: Masha goes to camp, and the "other Masha" calmly returns home.
At camp, Masha meets her "old" acquaintances - the swindlers Hahal and Nyanya, who are again plotting something bad. Masha and her new friend Vika decide to fight back and develop a cunning plan with sophisticated traps to prevent the villains from carrying out their plans.
