Celia Henry and Luke Gaines shared only one passionate night before he disappears from her life for months, only to return...changed. The day after their one-night stand, Luke survived a cave exploration gone horribly wrong and learned the truth about the monsters that made their home in the dark. Now he hunts the evil creatures that tormented him, his only comfort the explosive passion he and Celia discover they still share. Will love be enough to make Luke stay with Celia, or will his mission draw him away for good?