Underground (Greywalker, Book 3)

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.