Two 12-year-old girls, Charlotte "Charlie" Palfy from Berlin and Louise Kröger from Hamburg, meet on a train going to a language school in Scotland. They are shocked to see how much they look alike. They soon find out they are identical twins. Shortly after their birth, their parents split up, and each of them took one girl. Neither girl knew she had a twin sister, and they both believed their other parent was dead. Though they look alike, they are very different in personality. Charlie, as the daughter of a music hall composer, is cool, self-confident, and somewhat impolite, dresses accordingly, and listens to Techno Music. Louise, who grew up with her mother, who works in advertising, wears conservative clothing and is rather shy and quiet.