Agatha Christie’s *The Sittaford Mystery*, first published in 1931, is a classic example of the work of this master of detective fiction. It appeared in the U.S. at the same time under the title The Murder at Hazelmoor.

The novel is set on the edge of Dartmoor, a rugged, brooding upland in Devonshire, southwestern England. The tiny village of Sittaford, “at all times remote from the world,” Christie tells us, is even more isolated because of a huge snowstorm.…