Caledonia Mills {An Daigear in Gaelic) is a community in the Canadian province of Nova Scotia, located in Antigonish County. This is the community of the Mary-Ellen the spook farm, also known as the fire spook. This story about Mary-Ellen the spook got the attention of Sir Arthur Conan Doyle, the author of Sherlock Holmes. Mary-Ellen's biological parents were John and Annie (Duggan) MacDonald and was later adopted by Alexander and Janet MacDonald of Caledonia Mills.