<p>There is one universal question to which there seems to be no definitive answer: what happens to us when we die? Many people have their own individual theories; different faiths have different beliefs. The rest of us we can merely shrug and resign ourselves to the fact that we can never know the unknowable. Just a few years ago, Susan Starkey would have felt the same way. But following a move to Spain, a sequence of astonishing events changed ...