The Black Doctor
T. T. Flynn
Published in Dime Detective Magazine, December 1932. Collected in .
Valentine Easton is aboard an ocean liner returning to America from England when he comes into contact with two fellow agents, both female, and the three will become involved in the investigation into a couple of murders on the vessel. The sleuthing continues on arrival in New York as they discover their target is a notorious freelance spy known as the Black Doctor.