Masha embarks on a summer road trip with her dad in an RV. Three years ago, her parents promised her they would spend more time together, and now this nature getaway has become a family tradition. But Masha has grown up and finds it boring to spend so much time with her parents. The teenage soul craves new adventures, but the adults just don’t understand. One of the stops on their journey is a campsite. There, a bus carrying teenagers to a summer camp also pulls in. Masha meets one of the girls—coincidentally also named Masha—who doesn’t want to go to camp at all. Without much thought, the girls switch places: Masha heads to the camp, while the “other Masha” calmly returns home.
At the camp, Masha runs into her “old” acquaintances—the troublemakers Khakhal and Nyanya, who are up to no good again. Together with her new friend Vika, Masha decides to stand up to them and devises a clever plan with intricate traps to stop the villains from carrying out their scheme.