For centuries, twelve Guardians and the Knights who serve them have protected Mankind from the fearsome Keres, ancient creatures with a thirst for souls. However, a series of sudden and brutal attacks threatens the fragile peace between Realms. Now Hawk, a Knight who bows before no one, and Kira, a young inventor, find themselves in the eye of the storm and will have to rely on each other to navigate through decadent courts of intrigue and deceit...