"Harper Blaine was your average small-time Pl until she died - for two minutes. Now Harper is a Greywalker, walking the thin line between the living world and the paranormal realm. And she's discovering that her new abilities are landing her all sorts of "strange" cases." "In the clays lending up to Halloween, Harper is hired by a university research group attempting to create an artificial poltergeist. The head researcher suspects someone is faking the phenomena, hut Harper's investigation reveals something else entirely - the group has succeeded." "When one of the group's members is found dead in a brutal and inexplicable fashion. Harper must determine whether the killer is the ghost itself - or someone all too human."--BOOK JACKET.