Anna Walker has the unique ability to step into people's dreams. When a catatonic woman is brought to the hospital where she works, her curiosity overrides her common sense and she "walks" inside the girl's head.

Worst mistake ever.

Now she's on the radar of a fallen angel, Azriel, and her calm, quiet world is turned upside down. Azriel demands she use her walking talent to find the Horn of Gabriel, one of five Holy Relics, or lose everything dear to her. Even worse? His Heavenly counterpart, a messenger angel, insists on hiring her for the same job.

Her refusal to help comes at a steep price. When Azriel frames her for murders she didn't commit, it forces her into the quest for the holy relic. Torn between good and evil, she becomes trapped in her own nightmare when she uncovers a family prophecy claiming she's the Keeper of the Holy Relics.

Anna must make the most important decision of her life--accept her duty as Keeper, and the only person who can stop the coming war between Heaven and Hell--or stand back and watch the forces of good and evil destroy mankind.