A monster creeps along the edges of the Court boundaries, slaughtering any fey it can get its claws on.  As the Knights of the faerie queens, it falls to Kestrel and Jasper to protect their courts. But in order to do so, they go against centuries of tradition and mistrust.  In a wild, ancient forest entangled with secrets, they must unravel an ancient curse and stop the slaughter, before the monster’s next targets—the queens—are destroyed, and the safe havens of all fey with them.