Several years ago I was setting up a display at work when this book "Poltergeist" by Kat Richardson caught my eye. I picked it up and started reading the back in a second I was hooked. Event though this is the second book in the series (book one is, "Greywalker"), it is still my favorite so far in the series.
These are the chronicles of PI Harper Blaine, who was attacked and beaten to the point of death. After being dead for 2 minutes Harper is revived and discovers she is now a Greywalker, one who can navigate between the grey veil that separates our world from the world of the dead (or in some case undead). Her world is turned upside down as she must learn to control this new ability while trying to stay off the radar of those who will try to use her for their own agendas.
The story lines in each book are intertwined and add layers to each new book in the series (fans of the Dresden Files will really enjoy these books). The characters we meet are thoughtfully created and are either very endearing or terrifying to Harper's life.
In this story Harper is called upon to investigate a possible poltergeist that seems to haunting a university research group and now appears to have murdered one of the members of the group. As she digs deeper she discovers that the poltergeist was artificially created and may be controlled by one of the group members. There is one great chase seen where Harper is hunting the poltergeist and she chases it through Seattle's downtown shopping district (she finally corners it in the Science Fiction Fantasy section of Barnes & Noble).
Check out this series, it will be one you cannot put down and you will be begging for more in the series.