The Willington Mill haunting is extraordinary, so extraordinary in fact that one of the first reactions would be to dismiss it as a huge, elaborate hoax.
Every single paranormal phenomenon known to man (or nearly so) happened during the eleven years of the hauntings: from simple rappings on the walls to unbelievable pieces of materialization, like the child doppelganger or even a monkey which appeared out of nowhere only to disappear into nothingness when the children set out to hunt for it.
As Brad Steiger rightly (and perhaps sarcastically) remarked the most unbelievable event was how long the Procter family resisted in face of these unexplainable events before abandoning the mill.
Angel, I think you may find the following case interesting. Try digging out a picture of that celebrated medium, Florence Cook, and then look for a picture of her famous ghost-guide, Katie King.
You'll immediately notice how similar they are.
Of course the first reaction would be pretty simple: "it's the medium dressing up!". Sir William Crookes, the famous physicist and chemist who investigated into the whole affair, has often been suspected of "covering up" for Florence.
Moreover, after Katie announced that she was leaving Florence in 1875, the medium found herself a new spirit-guide, Marie.
A scandal of enormous proportions broke out when in 1880 Sir George Sitwell grabbed Marie during a seance, ordered the lights turned on and discovered that the girl-guide was really the medium in her underwear, clad in a light veil.
Yet Katie appeared in many other seances where Florence was not present, including a number after her death (1904). Her last known apparition was at seance in Rome in 1974: Katie greeted the presents by holding their hands and kissing them on the forehead, then talked with the medium, hugged him and left him a bouquet of flowers (another piece of sophisticated materialization) as a farewell present.
Was Katie King a fraud, a true spirit or piece of materialization generated by Florence Cook? If so how could her appear over and over again when her creator was long dead?
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Fas: Ite, Maledicti, In Ignem Aeternum.