This "psychic photograph" from Arthur Conan Doyle's book, The Case for Spirit Photography, shows a ghost with the likeness of a man's first wife that appeared on the plate. Was it a hoax or true capture of a ghost? Doyle believed it to be credible evidence in support of ghosts and spirits. This same photo also appears on the cover of his book.
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Psychic photo reveals what could be the image of his first wife (comparison photo included)...