When a mysterious girl appears at Beacon Hills during the rise of Deucalion, no one knows what she really is. Beautiful, dangerous, and impossible to read, she stands at the side of the Alpha pack—provoking, manipulating, and playing her own game. Especially with Stiles Stilinski. But behind her cold and cruel facade lies a secret no one would ever expect: she isn’t just dangerous… she’s something that shouldn’t even exist.