“The little gray cells,” so often referred to by the great detective Hercule Poirot, certainly get in their fine-work in this intriguing mystery story by an exceptionally talented writer. Alec Simpson, R. N., stepped from the platform at Newton Abbot into a first-class compartment of the Plymouth Express. A porter followed him with a heavy suitcase. He was about to swing it up to the rack, but the young sailor stopped him. “No—leave it on the seat. I’ll put it up later. Here you are.” “Thank you