Daeva, known to common folk as Fades and Shadows, haunt the West, wild lands still outside the grasp of civilization. Shae Winter is a Sentinel, part-protector, part-killer, trained from youth to hunt the shades and monsters of the West.

A virus wiped out every male on Earth, leaving the females to carry on alone. Now, five centuries later, the genome is breaking down and the only hope may lie in something long lost.