Mystery and Detection with the Thinking Machine, Volume 2 — Jacques Futrelle

Two plus two makes four, not some of the time, but all of the time. That's the creed of The Thinking Machine, Jacques Futrelle's classic crime and puzzle solver, who uses logic to solve mysteries and the power of his focused mind to think through knotty situations. This second volume has 21 short stories, and the novel, The Chase of the Golden Plate.