For more than 150 years, British and Commonwealth governments have investigated incidents of paranormal and unexplained phenomena. The existence of these investigations has long been denied, with files kept under lock and key amid concerns over the public reaction should they ever be revealed. Now, for the first time, the full extent of these secret investigations is brought to light. Britain's X-Files examines a intriguing range of cases, from Comet plane disasters and premonitions surrounding the Aberfan disaster, to the legend of the Flying Dutchman, Harry Grindell Matthews and his Death Ray, the Beast of Bodmin, Uri Geller, and more.