Margery the Medium used the ghost of her dead brother Walter to conduct her séances. When Scientific American Magazine put forth a contest with a $2500 prize for any medium who could produce verifiable psychic phenomena , Sir Arthur Conan Doyle recommended her. Harry Houdini was not having it and made it his mission to expose Margery as a fraud.

Further Reading:

The Witch of Lime Street by David Jaher - https://www.goodreads.com/book/show/24724228-the-witch-of-lime-street

The Medium and the Magician on History Net - https://www.historynet.com/mina-crandon-harry-houdini-the-medium-and-the-magician.htm

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