Nice period piece involving two federal marshals and their search for an alleged missing patient at the fictional "Shutter Island" somewhere near Boston. Scorsese & Co. masterfully provide the audience with a brooding ambiance, via incessant storms; darkened corridors; and the overall brooding notion that things aren't what they seem. Indeed, they are not. Although the twist ending is a surprise, various red herrings allude to the narrative's outcome. My only complaint is the inordinate buildup to the twist ending, which occurs only in the last 30 minutes of the film. Thus, the viewer leaves the two-hour buildup with a rather bland aftertaste for what could have been one of the year's best films.