By 1929, Arthur Conan Doyle had retired Sherlock Holmes, and his stories had more fantastical elements than Holmes would have put up with. The title story of The Maracot Deep and Other Stories involves encounters with supernatural beings in Atlantis. “The Disintegration Machine”, another story in the collection, and his last featuring Professor Challenger, deals with an invention not unlike Star Trek‘s later transporter. The book joins the public domain in 53 days. #PublicDomainDayCountdown