Equal parts Light and Shadow, Joanna Archer must fulfill a destiny she never wanted. Once a photographer and heiress to a casino fortune, she is now dedicated to the cause of good... but susceptible to the seductions of evil.

A deadly virus is descending on Las Vegas — a terrifying plague unleashed by the powerful overlord of Zodiac's dark side: Joanna's father. Chaos and panic grip Sin City as agents of Light fall prey to the terrifying epidemic. Death reigns supreme — and Joanna stands at dead center of an epic and terrible war long foretold, the last hope of a damned world.

But first she must somehow conquer the malevolence that grows all around her... and within.