Stories 4 through 6 in the Hamlet Mysteries series in which Sam, house sitting for his parents in his home town of Hamlet, and the people of Hamlet are haunted by green ghosts from the swamps, Sam becomes the bait in a carefully orchestrated plot to catch a killer and the deadly Misty returns as some kind of dark angel. Sam will have to navigate his way through that and still deal with the crazy residents of the small town of Hamlet.