Sarah has always been on the move. Her mother hates the cold, so every few months her parents pack their bags and drag her off after the sun. She's grown up lonely and longing for magic. She doesn't know that it's magic her parents are running from.

When Sarah's mother walks out on their family, all the strange old magic they have tried to hide from comes rising into their mundane world. Her father begins to change into something wild and beastly, but before his transformation is complete, he takes Sarah to her grandparents―people she has never met, didn't even know were still alive.

Deep in the forest, in a crumbling ruin of a castle, Sarah begins to untangle the layers of curses affecting her family bloodlines, until she discovers that the curse has carried over to her, too. The day she falls in love for the first time, Sarah will transform into a beast . . . unless she can figure out a way to break the curse forever.