Book 4 in the NYT & USA Today Bestselling “Signs of the Zodiac” series ...

In Sin City, a little girl suffers from a mysterious and terrible malady. If she dies, the Light will perish alongside her.

Warrior, avenger, superhero, Joanna Archer has survived countless otherworldly horrors, and discovered her rightful role among the agents battling the pervasive evil of Shadow . . . even while struggling against the darkness lurking within.

Yet a war is raging for the heart of an increasingly dangerous Las Vegas, catapulting Joanna into a lethally seductive world hidden from mortal sight. As the lines between good and evil continue to blur, Joanna must soon decide how much of herself she’s willing to risk to save one child … because preserving the Light will require a piece of her own soul, and the odds of her escaping any world are soon slim … to none.