This article first appeared in Radio Times magazine.“It’s about one man’s psychosexual secret – but if it weren’t for that very private problem, we might not be living in the same world today,” says Ben Macintyre. “In fact, the world might not exist at all.”Book blurb bluster? “It’s no exaggeration,” insists the author and associate editor at The Times. “This guy is unlike any other spy that I’ve ever come across, and it’s the strangest, most fa…