A Sky so Full of Stars

Gothel kidnapped Rapunzel as an infant and, four years later, hears about Varian's moonstone powers and kidnaps him too. And so Varian and Rapunzel grew up together in a tower away from everything, and made-do with the boredom, until Flynn Rider, thief extraordinaire, shows up in the tower. This starts the siblings' process of questioning everything their mother ever told them, and coming face to face with truths they may not be ready for.