A thousand years ago, a brutal warrior roamed the Russian steppes. Driven by his craving for power, Konstantine struck a terrible bargain. In return for the ability to change at will into a cold-hearted predator, he promised his soul, and the souls of his descendants, to the devil. Then one day a dangerous prophecy reveals the truth: one family has been chosen to battle the darkness — or face damnation. Plain Ann Smith loves her handsome, dynamic boss, Jasha Wilder, but her daring plan to seduce him goes awry when she encounters a powerful wolf who, before her horrified eyes, changes into the man she adores. She flees, he pursues, but they can't escape their destinies. For Jasha is Konstantine's descendant and Ann is the woman fated to break the curse that binds his soul. To find heaven in each other's arms, they have the devil to pay.