In 1685 George Sinclair, the brother of Maister Thomas Sinclair, the man who revealed Major Thomas Weir's confession to the authorities, published a book titled Satan's Invisible World Discovered, which contained a number of stories that neatly outlined the leading superstitions of the day.

Among them, although never referred to as such, is one of the earliest ever recorded cases of an apparent poltergeist...

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Season 6 Episode 21 Extra: The Invisible World