The letter makes mention to not only Shakespeare, but to Witchcraft as well. The letter has been hand signed by Houdini at the end of it. The handsome autograph has been authenticated by PSADNA and will include a full letter of authenticity. In 1584, Reginald Scot - a country gentleman and MP from Kent - published The discoverie of witchcraft, a sceptical treatise recording and debunking popular and scholarly beliefs about witchcraft, magic and other superstitions.
Scot argued that belief in magic was both irrational and un-Christian. He suggested non-magical reasons and causes for both magical phenomena and accusations of witchcraft. It is widely believed that Shakespeare had read Scot and that the book is one possible source for the witches of Macbeth.