Ghosts, spirits, banshees, call them what you will – but there is a very clear belief among some people that these spiritual entities exist. And what’s more, that they don’t just float through everyday life, but are capable of, and willing to, communicate with humanity. This isn’t a new idea, either; every religion in the world has views on the subject. It might be said that speaking to and communicating with the dead is one of mankind’s oldest beliefs.