After being shot in the back and dying—again—Harper's recovery has been hard. She's lost a great many of the powers she'd acquired since first becoming a Greywalker, and Harper knows that if she dies again, she won't be coming back.

Her only respite from the chaos is her work. But while conducting a pre-trial investigation in the Olympic Peninsula, she witnesses the ghostly echo of a fatal car accident for which there are no records. Worse still, the victim of the wreck insists he was actually murdered, and that the nearby mountain resort—called "Blood Lake" by locals—is to blame.

The picturesque area is as unlikely a haven for conspiracy and malignant magic as Harper's ever seen. But she soon learns that the icy waters of the lake hide a terrible power, and a host of hellish beings. And both are held under the thrall of sinister mages who will use the darkest of arts to achieve their fiendish ends…