Mack might be, to all intents and purposes, a normal looking human, but she lives with a pack of shapeshifters in Cornwall in rural England after being dumped there by her mother when she was just a young child. She desperately wants to be accepted by her surrogate family, not least because a lot of them hate her for merely being human, but for some reason her blood just won't allow the transformation to occur. With a terrible temper to match her fiery red hair, Mack is extraordinarily useful in a fight, and when her pack alpha is brutally and abruptly murdered, she swears vengeance. Unfortunately, his murder also draws in the Brethren - the leaders of the shapeshifter world - who will slaughter everyone in Mack's small rural pack if they discover her true identity …