A new story about the run-up to 9/11 has emerged–a previously undisclosed, covert C.I.A. effort to recruit a spy to penetrate Al Qaeda a year and a half before the planes crashed into the towers. The development is intriguing in part because the informant they were after was thought to be secretly gay. There’s nothing new about gay spies — gay men have long been thought to make especially good undercover agents because they are so used to living double lives. But if Hollywood turns this story into a movie you can bet at least one thing will be changed: the informant was tall and fat, and the movies will make him tall and buff.