In February 1862 a riot broke out in a Suffolk churchyard over a ghost story. Margaretta Greene, the story’s author, originated an enduring legend of the ghost of a nun, Maude Carew, who haunts the ruins of the Abbey of Bury St Edmunds. But the story of Maude Carew, and the riot she inspired, raises intriguing questions about the origins of folklore and beliefs about the supernatural.