In the cold of winter, Pioneer Square's homeless are being butchered, and zombies have been seen roaming the streets of the underground city buried beneath modern Seattle. Greywalker H arper Blaine is asked to investigate by her friend Quinton, who fears he may be implicated in the deaths. They soon discover that someone has unleashed a monster of ancient legend- and H arper must deal with both the living and the dead to find the creature and put a stop to it...unless it stops her first.