In a war between worlds, there can only be one victor. The fate of the world hangs in the balance. Despite barely escaping their last encounter with her life, Cassidy Wright will do everything in her power to beat Serenity at her own game. Even if that means teaming up with Roman, the fae who betrayed her. As they race Serenity and her vampires through a deadly cave system, Cassidy isn't sure what's more at stake....her life, or her heart. But all of that pales in comparison to the pressure Cassidy feels when she learns the shocking truth about her identity...and her role in a battle centuries in the making. Now Serenity is one gem away from completing the sword that will unleash a nightmare of bloodthirsty, rogue fae into the world. Unless Cassidy finds it first. The stakes have never been higher as failure could doom the fate of both realms. Roman is the only one who can help her, but he’s got an agenda of his own. Can Cassidy trust him in the most important fight of them all—the one that could end the human race?