Ava López’s best friend from childhood is missing, and her former coven has asked for her help to find her. Despite all the pain the witches have treated Ava to with their rejection, she is determined to find Liv—even though her new allies harbor resentment. Ava hopes finding Liv will put an end to the feud between the two groups, but she realizes that to help the witches, she must turn her back on the vampires. But this is the least of her problems. Ava must choose sides and test loyalties with a decision that comes at a cost—one even Ava, with her ever-growing powers and connection to spirit magic, never could have foreseen. To repent for her disloyalty, Ava must bind herself to a dark promise. A promise no magic can break.