The hyper-rational side of his personality that Arthur Conan Doyle aired in his Sherlock Holmes series of detective tales was only one piece of the puzzle. Conan Doyle also had a mystical side, and he was fascinated by the supernatural and the occult. In the epistolary stories collected in The Stark Munro Letters, he masterfully combines both of his passions, exploring supernatural themes from the perspective of a master detective.