Publisher's Synopsis
Abby and Gretchen have been best friends since fifth grade, when they bonded over a shared love of E.T., roller-skating parties, and scratch-and-sniff stickers. But when they arrive at high school, things change. Gretchen begins to act different. And as the strange coincidences and bizarre behaviour start to pile up, Abby realises there's only one possible explanation - Gretchen, her favourite person in the world, has a demon living inside her. And Abby is not about to let anyone or anything come between her and her best friend.
