Into the shadow (2008)

Blessed—or cursed—with the ability to change into a sleek panther, and driven by a dark soul he's accepted as his fate, Adrik Wilder abandons his family and his honor to pursue a life of wickedness. He excels at every vice, including kidnapping Karen Sonnet to use for his selfish purposes. But Karen's spirit and passion make him question the force of his family's curse. And when a new evil emerges, Adrik must choose whether to enact revenge on his enemies and redeem his soul, or save Karen from a fate worse than death...