Instruct: Classify a given review as either positive or negative.
Query: A Graham Greene-ian Entertainment

"Enigma" is an absorbing World War II drama of suspense as long as one takes it as what Graham Greene called "an entertainment" and does not press it too hard for historical accuracy. Because it has several subplots, which become clear only after repeated viewings, the movie leaves the viewer grasping at a few loose ends that are never tied up completely. With an intelligent script by playwright Tom Stoppard, "Enigma" works best when it focuses upon the Bletchley Park team of classicists, mathematicians, and other academics working on cracking the intercepts of German submarine traffic in the North Atlantic. It works less well when it veers off into car, train, and motorboat chases. Nevertheless, clever plot twists, atmospheric English locations, and a talented cast, which includes Kate Winslet, Jeremy Northam, Tom Hollander, Matthew MacFadyen, and Corin Redgrave, ensure that the viewer will be thoroughly entertained.