Valeria Jensen and her partner, Matthew Briggs, barely survived their hunt for a very dangerous weapon and managed to uncover a sinister plot among the witches along the way. Normalcy should have returned to Valeria's life with the talisman destroyed, and the reaper returned to the Underworld, but an unknown threat soon emerges.

When strange and impossible things begin happening to the creatures of the Subworld, Valeria seeks help from unexpected places and uses her powers in ways she never imagined. As an invisible danger looms over the city like a plague, she must tap into a power she didn't know she had before it consumes everything she holds dear. With thousands of lives on the line, will she be able to stop this new threat, or will the darkness be too much for even an angel?