"You're a monster. All the children here are monsters. This is the Academy for Monsters." Falcon Quinn and his neighbors, Max and Megan, board bus #13 for school on an ordinary day in Maine. Only the bus doesn't take its ordinary route, and the friends soon find themselves in an extraordinary place—on Shadow Island, at the Academy for Monsters. With a student body stranger than the cast of any monster movie, the academy is home to creatures of all kinds. Falcon has always felt different, with his one bright blue eye and one shadow-black eye, but will he discover the other thing that makes him different when he finds himself in the Black Mirror? And when he learns that the school's mission is to teach students to hide their monster natures, Falcon and his friends need to find a way to fight back.
