Hermione Granger and the Magic Blue Box

Hermione is wandering London, not sure what to do with herself, when she hears a strange wheezing noise. She follows the sound and meets the Doctor, who is looking for Clara Oswald, an impossible girl who's died twice. Hermione agrees to help him look for her as long as he gets her back before her exams, forming an unlikely friendship with another Hogwarts student along the way.