Marion Harvey was a Brazilian-born American lawyer who wrote a number of detective novels and plays in the 1920s. A rather elusive figure, he practised law in Ohio before moving to Los Angeles. A discovery of innovative New York publisher, Edward J. Clode (publisher of Armitage Trail’s *Scarface*), his 1922 debut novel, *The Mystery of the Hidden Room* was very well received, and introduced amateur sleuth Graydon McKelvie. [from GoodReads] Harvey went on to write several mystery novels and plays between 1922 and 1935. These include *The Vengeance of the Ivory Skull, The Clue of the Clock, The House of Seclusion*, and *The Arden Mystery*. [Barnes&Noble] These works often feature Graydon McKelvie, a Sherlock Holmes-worshipping detective. S.S. Van Dine noted in *The Great Detective Stories*, (1927) that “The deductive work done by Graydon McKelvie is at times extremely clever.” Harvey’s plays have been performed in New York, Alabama and Pennsylvania.