Ben has always been troubled by violent nightmares about killing other people. Now they're getting worse and he doesn't know why - until he meets Nina, a beautiful woman with a secret. In the dark of night, she can transform into a demonic killing machine known as a Shriven. She reveals to Ben that he is also a Shriven, and is destined to become her mate. However Ben is horrified to learn that the Shriven must feed on humans in order to live!