A History of Quarston is a book in two distinct halves. Writing under the pseudonym C.Z. Moss, the author uses the first half to relate the history of Cornwall, from ancient times to the early 18th century, with special attention given to an estate near Tintagel called Quarston. Then, switching gears, Moss uses the second half to describe the experience of living at Quarston with his brother, a strange mystic dubbed "Bellwether Moss" by locals. What results is an incredible story of the supernatural, involving people and places that may or may not have existed.