In 1840, twelve-year-old Mary Jobson lay ill in a Sunderland tenement when the knocks began — always three times.

Then a voice claiming to be Jesus started speaking from her bedside.

Documented in detail by respected physician Dr William Reid Clanny, this is one of the strangest and least-known poltergeist cases of the 19th century.

Heavenly music, family secrets revealed, a miraculous recovery… and the shadow of the cholera epidemic that first hit Britain in Sunderland.

Historian Stephen of The Poltergeist Project tells the full story.