The fey are the most beautiful creatures in the world, but they are also the most deadly. Kaia is one of them, prized for her exceptional shapeshifting powers, despite being only fifteen. She, and the rest of her troop, are sworn to fight the war against Zilla Nyx and her dark fey. When the war becomes a battle of spies, instead of brutal fighting, Kaia must do as she has sworn: protect her kingdom at all costs. But what cost is too much?