Wow, I have no idea what Winterbottom is trying to do now. As noted by Paul Byrnes, this is something in the vein of No Country for Old Men (etc) but even more brutal. Suspense was a bit hard to come by after the first half as the main character really does only have one modus operandi, and isn't that clever. Pullman has almost a cameo role, somewhat to my chagrin, and the ending is too Romeo and Juliet.
Completely unnecessary.