Hercule Poirot, The Submarine Plans (Unabridged)

In Agatha Christie's short story, «The Submarine Plans,» Poirot is summoned to the home of Lord Alloway, head of the Ministry of Defense, to investigate the theft of top-secret plans for a new submarine. With the First Sea Lord and his wife, and a mysterious Mrs. Conroy all staying the night, the suspects are numerous. This short story originally appeared in the November 7, 1923 issue of The Sketch magazine.