Anne Frank and her family were betrayed by a neighbour 79 years ago. In 1987 I covered the trial of the Butcher of Lyon, Klaus Barbie. Hearing that a man he’d arrested still lived near Lyon, I went to interview him. ‘How did Barbie know about you?’ I asked. ‘My neighbour betrayed me.’ ‘What happened to him?’ ‘He’s still my neighbour.’ And indeed I could see that the neighbour was actually in his garden, listening to us. He ran indoors when we started filming him. Imagine living 40 years next to the man who’d sent you to a concentration camp.