Touch of Darkness by Christina Dodd

Handsome, powerful Rurik Wilder holds the power to transform himself into a fierce bird of prey-a gift that's caused death and destruction. 

At last he's offered the chance to redeem himself. Only one woman stands in his way-a beautiful writer determined to wreak revenge on the assassins who murdered her family. Assassins, it's been rumored, who have powers no human should ever possess...