The case of Lurancy Vennum is often described as America’s strangest possession case.

In 1877, in the small town of Watseka, Illinois, a young girl began falling into violent trances. She spoke in unfamiliar voices, claimed to see dead people standing in her room, and seemed to lose awareness of the world around her.

What followed drew physicians, spiritualists, sceptics, and newspaper reporters from across the country.

But this wasn’t a medieval witch trial or local legend. It happened in front of witnesses. Doctors documented it. Families opened their homes to investigators. And for months, an ordinary household became the centre of one of the most disturbing paranormal cases in American history.

In this episode, we explore the full story of the "Watseka Wonder" - from the first signs something was wrong, to the alleged spirit of Mary Roff, and the question that still hangs over the case nearly 150 years later:

Was this possession, psychological trauma… or something far stranger?