Dead Wolf Walking

Third installment of the Shapes of Autumn series. 

When a tragic death triggers Autumn and Zack's worst fear—pursuit by dangerous werewolves—they escape to a safe house. But within the walls of the refuge, an even greater menace looms. Now under the reluctant protection of a vampire king, Autumn and Zack are targeted by a palace full of vamps out for revenge against vampire-killing werewolves. 

After the vampire king discovers a rebel plot to overthrow him, Zack and Autumn are forced to remain in the palace as bait to draw out the enemy. But can the king shield them from so many who want them dead? They have only days to root out the traitors before Autumn's parents arrive to claim her—not to mention it's illegal to mix species—which gives them little hope of a future together. But with werewolves hunting them and vampire rebels out for their blood, Zack and Autumn need each other more than ever. Each secretly dreams of finding a way to be together—if they can stay alive. 

Books in the Shapes of Autumn series: 
0.2 Thrown to the Wolves: The Legend of Hannah & Eli 
1. My Wolf's Bane 
2. Wolves at the Door 
3. Dead Wolf Walking 
4. The Dark Wolf 
5. Lord of the Wolves