Some might call Elsa's granny 'eccentric', or even 'crazy'. Elsa calls her a superhero. And granny's stories, of knights and princesses and dragons and castles, are her superpower. Because, as Elsa is starting to learn, heroes and villains don't always exist in imaginary kingdoms; they could live just down the hallway. As Christmas draws near, even the best superhero grandmothers may have one or two things they'd like to apologize for. And, in the process, Elsa can have some breath-taking adventures of her own...