Wren is a nightmare: a deadly manifestation of the frightening dreams of humans. She is forever bound to the insidious Para Warwick, the only night creature who can cross the boundary between the dream and waking realms. When she fails to retrieve information on a weapon that could finally end Warwick’s reign and is severely punished, she makes a snap decision to aid the growing rebellion in finding it. The waking world is no better off. Prince Caine Fallon, Warwick's ignorant human son, prepares to wed Ila Enevoldson, the young queen from a neighboring kingdom. But Ila is more than she seems: She has lost a precious weapon entrusted to her. She will do anything to retrieve it, including agreeing to an engagement with the son of her sworn enemy. Their destinies collide with those of the two lethal nightmares, and they are forced to band together to stop the vicious dictator—and prevent the very fabric of reality from unravelling.