Shadowmaster (Nightsiders Book 3)

Humans and vampires stand on the brink of war in this gripping series by New York Times bestselling author Susan Krinard 

In the crumbling outpost of San Francisco, a fragile truce is threatened by an assassination plot. Half-dhampir agent Phoenix Stryker has the beauty, brains—and blood—to infiltrate the vampires' secret society and save the city. But once she's in, she finds that her target, the assassin Drakon, is not the monster she expected. Handsome, honorable and irresistibly attractive, Drakon will stop at nothing to save his people—and protect the woman he needs even more than the blood that keeps him alive. Now the key to the world's survival may lie in their dangerous alliance….