GK Chesterton is said to have famously observed that when people stop believing in God, they don't believe in nothing, they believe in anything. It's often quoted in order to dismiss whatever conspiracy theories happen to be in popular circulation at any given time and, while it is undeniably a good line, it doesn't honour the sense of betrayal or hunger for 'the truth' that often underpins the appeal of such stories. This month's column looks at three recent* films which prompted me to think again about the relationship between private beliefs and public events.