After the complex, troubling "Mystic River" I was concerned that Lehane would return to the fairly-unimpressive Kenzie/Gennaro sreies which first put him on the map. Instead he delivers an equally complex, troubling book, but one that is about as different from "Mystic River" as could be."Shutter Island," had me by the throat from the first chapter and never let go until the final haunting page. Part detective thriller, part horror story, the book moves at a breakneck pace, while serving up crackling dialogue and hairpin twists. "Mystic River" clearly wasn't a fluke, and if his hot streak continues, Lehane may yet emerge as one of the best crime writers of the new millennium.