Ever since Japer lost his family, he's been hunting those responsible.
Grace is summoned home to find the creatures who murdered Jasper's family. One night she bumps into a man that saves her from being mugged. Grace's heart softens toward this gallant stranger, and they spend a glorious evening together making love. Not expecting to see him again, she discovers Jasper, her knight, has been training as a vampire hunter.
Jasper wants to protect Grace from the evil fiends he's hunting. She pleads with him not to continue on his hunting forays for fear she will lose him.
Together, they must face the darkness that awaits them in Boston's underbelly before the monsters decide to hunt them.