George Holley, founder of Holley Motor Company, and Sir Arthur Conan Doyle, famed author, became acquainted after Holley attended one of Doyle's lectures in Detroit. From 1923 to 1929, the two maintained a robust correspondence. Spiritualism was a frequent topic as they traded recommendations of mediums, bemoaned skeptics like Harry Houdini, and discussed the state of belief on both sides of the Atlantic.