A MYSTERY HOUSE BOOK: Jasper Groat was a tidy man with a tidy conscience. This very passion for neatness--he had seen fit to record all the harrowing details of the torpedoing of the S. S. Okeechobee and his subsequent experiences on a life raft--caused his murder. For another man had died on the raft and, as Mike Shayne explained: "When a man thinks he's going to die he tells things he wouldn't dream of telling otherwise--things that wouldn't look good in print."