Slave to her step-father and his daughter, Isadora longed for the day when she could leave her manor for good. Little did she know it would come sooner than she thought. When the Dark Prince comes to claim her step-sister as his bride, she forces Isadora to switch places with her, thinking no one would want to claim Isadora as their own. The Dark Prince disagreed. He is the king's favored assassin, and the hand of justice that's an extension of the king's will. And now Isadora must share his bed. Yet something is wrong back at the Dark Prince's castle, where his people gaze at her with a lingering darkness in their eyes. A beast roams the woods at night, but no one seems to care. A witch in the woods admits the Dark Prince and his people are under a curse, and Isadora might be their only chance to undo it before it consumes the entire kingdom.