Brock, Lynn: The Deductions of Colonel Gore (1924); v1; 14 Dec 2019
 

Lynn Brock is the pseudonym of Andrew Patrick McAllister (1877-1943), who wrote a series of books featuring his detective Colonel Gore. There is some suggestion that this, the first book, was intended to be a stand-alone, and a somewhat satirical look at detective fiction, but it was so well received that the author modified Gore into a series character, later making him a private detective.