An unexpected phone call heralds a new challenge for Mercy. Her mate Adam' s ex-wife is in trouble, on the run from a stalker. Adam isn' t the kind of man to turn away a person in need-- and Mercy knows it. But with Christy holed up in Adam' s house, Mercy can' t shake the feeling that something about the situation isn' t right. Soon, her suspicions are confirmed when she learns that Christy has the farthest thing from good intentions. She wants Adam back and she' s willing to do whatever it takes to make it happen, including turning Adam' s pack against Mercy. Mercy isn' t about to step down without a fight, but there' s a more dangerous threat circling. Christy' s stalker is more than a bad man-- in fact, he may not be human at all. As the bodies start piling up, Mercy must put her personal troubles aside to face a creature with the power to tear her whole world apart.