Prometheus Protocol

Private investigator Tag Finn, a former special operations soldier and member of the CIA's elite Special Activities Division, is enjoying a beautiful Sausalito morning until one of Japan's most powerful businessmen shows up on his doorstep with an unusual problem. It turns out that a ruthless and brutal serial killer has ritualistically murdered three of his senior vice presidents, and now his son is the only remaining target. Finn reluctantly takes the job and travels to Japan to become a stranger in a strange land, where he must race against time as he tries to find the killer before she can strike again. Come along with Finn for adventure, intrigue, and some sexual hijinks that will take you from the pinnacle of Japanese society all the way down to a world inhabited by yakuza thugs, ancient secret societies, and a deadly, though beautiful, female assassin intent on revenge.