I’ve written a book about the supernatural – about ghosts, poltergeists, psychics, extrasensory perception, all that kind of stuff – which, until relatively recently, was not something I ever thought I would do. I am, I have always told myself, a sensible, sceptical, rational person. When I’m feeling pompous I congratulate myself on the fact that, as a journalist, I deal in the reporting of truths that help shine a light on an objective reality. So when I told my wife that I was dedicating a large chunk of my life to the paranormal, I knew immediately what she wanted to say. To her credit, she waited two weeks before she actually said it. “The thing is,” she finally snapped, after I’d been talking at her for some time about…