Growing up in Ember Grove, Bitsy Clark knows better than to break the rules around the Revelry, the mysterious end-of-year party in the woods. So when her best friend, Amy, persuades her to sneak in, Bitsy is full of misgivings. Misgivings that she should have listened to, because it's after the Revelry that Bitsy's luck turns and her life starts to unravel. For Amy it's the opposite, as if she's been blessed with good fortune. Soon Bitsy is convinced that the Revelry has tied the two friends together in a curse that only she can break.