The picture, taken by Edinburgh Ghost Hunting Society (EGHS), comes after a tourist's photo showed a similar figure in the foreground late last year, which prompted an investigation by the Psychical Research and Investigation Unit - part of the Sir Arthur Conan Doyle Centre (SACDC). SACDC say that while their initial thoughts were that someone had walked in front of the camera, a review of CCTV footage showed that no one had done so when the image was taken, and they do not know of any cases where there has been a similar scenario in two completely different investigations.