Geist is an Ace Books title released October 2010.
Geists don’t always play by the rules.
Sorcha Faris is a Deacon of the Order, and has vowed to stand between the citizens of the Empire and the geists, evil spirits from the Otherside that terrorize and possess the living. When her partner is critically injured, it’s up to Sorcha to investigate a surge of geist activity, with the help of a seafaring prince who bears a terrible curse- an ancient geist that resides within him.