F amiliarity breeds contempt, maybe especially in marriages. How do you keep a close partnership fresh? Perhaps married spies, like the ones in Steven Soderbergh’s silky spy caper Black Bag, have the answer. George Woodhouse ( Michael Fassbender ), an experienced operative at Britain’s National Cyber Security Centre, receives a list of five colleagues who are suspected of being moles, capable of activating a cyberworm designed to wreak nuclear havoc. No problem there—except his wife, fellow