It began with a key. One afternoon in 1956, in the home of the Hitchings family in Battersea, south London, a small silver key appeared on Shirley Hitchings' bed. This seemingly insignificant event heralded the beginning of one of the most terrifying, incredible and mysterious hauntings in British history. The spirit, who quickly became known as 'Donald', began to communicate, initially via tapping sounds, but over time - and with the encouragement...