Noc Feyreigner, leader of the assassins of Cruor, is living on borrowed time. If he fails to kill his final mark―Leena Edenfrell―his own life will be forfeit. With the dark magic of Curor's Oath testing his control, Noc has to fight with everything he is to keep the woman he loves safe. Leena would do anything to help Noc overcome the oath. So when she hears of a beast rumored to have the power needed to save Noc's life, she is quick to embark on an expedition to the frozen north. But what starts as a hunt for a magical beast quickly turns into Leena and her trusted band of assassins as prey...and time is running out.