There is a picture of former spy boss Thulani Dlomo, in a dark blue three-piece suit against a white shirt, ensconced in an armchair in an office, the South African flag behind him. His face tells a happy but confusing story. The twinkle in his eyes makes it hard to gauge whether he’s failing to stifle a rancorous laugh or if he’s simply giggling. Spies do that. They thrive on confusion, normally a consequence of information peddling...