Always Turn Left. Monsters Are Everywhere. Names Are Important. The Magus family has always lived in Swallowgate: charming Uncle Jordan, terrifying Aunt Mara, and now Mort, his mother, and his sister Anastasia. Mort soon discovers the strange and magical nature of Swallowgate House, but he isn't terribly worried even by the monsters. The adults won't let him be harmed. Everything will be all right. It's not. Suddenly, not even the crawlspaces that honeycomb the walls are safe. With enemies on all sides, Mort isn't sure he can keep protecting his sister . . . or even himself.