It might sound like the title for a gory, straight-to-video action movie, but Operation Mincemeat was a real World War II strategy – a secret Allied scheme to deceive the Nazis by dropping a corpse carrying fake military plans into enemy terrain, in the hopes that it might divert Hitler's forces from the real invasion planned for Sicily. Despite the absurdist potential of a story involving a reluctantly heroic stiff, this version of the event, from British filmmaker John Madden ( The Best Exotic Marigold Hotel ; Shakespeare in Love), is an earnest and tastefully mounted dramatic thriller starring a...