Forester, C.S. "Intelligence."

British Intelligence learns that particularly vile U-boat skipper Lothar Wolfgang von und zu Lowenstein (his "hobby" is taking photographs of drowning Allied mariners and other innocents who'd been aboard ship's that he's torpedoed; his prize photo is of a drowning woman and child who'd been passengers aboard the ATHENIA, sunk on Sept. 3, 1939) has orders to sink a huge liner-cum-troop transport, the fictitious QUEEN ANNE (the ship is certainly modeled after either the QUEEN MARY or QUEEN ELIZABETH). Back in the 1930s navy officer Capt. George Crowe ("C.B., D.S.O., R.N.") had often encountered the loathsome Nazi at international yachting events. He thinks he knows his man, psychologically speaking, and lays a trap to lure the German and his U-boat away from the troop ship. The lure? A faked up freighter that has been converted to look like the FROTTINGHAM (i.e., real life Swedish America Line vessel GRIPSHOLM), a diplomat exchange ship that is supposed to be sailing from New York to Europe. Aboard the real diplomat exchange ship will be a German enemy of Lowenstein's; Crowe figures that the U-boat commander will take the opportunity to sink the supposed diplomat ship, thus eliminating a personal enemy and making it appear that the U.S. Navy has e sunk the neutral vessel. Right on cue Lowenstein goes after the faux-FROTTINGHAM. In short order his German sub is destroyed by Allied navy forces. The German vessel goes down with all hands but one: the cowardly Lowenstein, who has elected to save himself. Forester closes the tale with war criminal Lowenstein about to be captured.