Labyrinth is the fifth book in Kat Richardson's Greywalker series. The stories take place in Seattle and revolve around P.I. Harper Blaine. At the beginning of the series, Harper is just your average investigator and then she dies for two minutes. When she comes back, she can see things the rest of us can't. She discovers that there is a “grey” side where the rules don't apply.
Blaine's life gets stranger and more complicated as she learns how to walk in the grey. Her clients get stranger and stranger and by book four she is working by the city's head vampire Edward Kammerling. In Labyrinth, Kammerling has disappeared. Harper comes face to face with his assistant, Bryson Goodall, who has been changed in some way. He is not a vampire but he's not human any more either.
The main bad guy of the book is a vampire called Wygan, who is an ancient Egyptian entity called the Pharaohn-ankh-astet. Goodall has become Wygan's ushabti, a day walking henchman with some extra-human powers. He wants to kill Harper but his boss needs her alive for a little bit longer. Harper has to stop Wygan's master plan, save Kammerling and come to grips with her grey given powers that keep getting stronger. Along the way she has to solve a riddle, save her father's ghost and keep all her friends out of harms way.
Anyone who likes Jim Butcher's Dresden novels will like the Greywalker series. Harper might remind some people of Anita Blake but she doesn't sleep with the monsters. She may be becoming more like them but she wants to have as little to do with them as possible. Vampire sex is kind of difficult when the smell of vampires makes you sick to your stomach.
By the end of Labyrinth, Harper has come into her full power. It will be interesting to see what she does with it when there is no crisis to focus it on.