Which one is the real monster? Celia Ashleigh, otherwise known as The Fox, is a shapeshifter and spy-in-training, like other firstborn Ashleighs. Remy Broussard and his sister are werewolves. But The Guardian of La Cluse is on a crusade to wipe out monsters like them. He's kidnapped Remy's little sister and plans to kill her when she changes for the first time. When Remy begs for help, Celia doesn't hesitate to take on a real mission. But the closer Celia comes to finding the madman and his captive, the more dangerous her task becomes... and the more hopeless. What will happen if Celia makes a mistake and the hate-filled crusader discovers she is something more than human, too?