As with the novel, the film follows the story of Luise Palfy and Lotte Körner, identical twin girls who were separated at two-and-a-half-years-old when their parents, Ludwig Palfy and Luiselotte Körner, divorced and split them up. Reuniting at a German all-girls' summer camp six-and-a-half years later, the two sisters switch places to be with the parents they were parted from.