Moonwalkers
Whatif Apollo 11 never made it? What if, in reality, Stanley Kubrick covertly shot the images of the moon landing in a studio? This can be the premise of a totally plausible conspiracy theory that takes to swinging sixties London, at which a obstinate CIA representative won't ever find Kubrick but is forced to team up with a poor manager of a seedy rock group to develop the greatest con of them all.