Maggie Blue is an outsider, both at home and at school. She lives with her eccentric aunt Esme, and has no friends other than the irascible Hoagy, a stray cat who can talk to her. When Magge sees Ida, her foe from school, being taken through a window to another world by one of their teachers who has transformed into a wolf, she is determined to save her, whatever the cost. But the dark world is full of danger, a place where happiness is valued above all else, and Maggie discovers that her role is far more important than anyone could have guessed. A thrilling and gripping tale of friendship, courage and the power of being yourself.