Jacques Futrelle's "The Thinking Machine" The Enigmatic Problems of Prof. Augustus S.F.X. Van Dusen, Ph. D., LL. D., F.R.S., M.D., M.D.S.

A collection of ingenious detective stories written by the early American mystery writers features the sleuthing talents of Professor Augustus S. F. X. Van Dusen, the "Thinking Machine," an eccentric scientist who uses his superior intellect and unique insights to solve impossible crimes. Original. 20,000 first printing.