When Mrs. Dover witnesses a young policeman's suicide and has the bad taste to report it, Dover's vacation ends abruptly at the seaside wasteland of Wallerton. As he sluggishly investigates the matter, an earlier case of murder and mutilation turns up as well. Suspecting that the town's Ladies' Club may be oddly involved, Dover devises and elaborate and utterly wicked trap. His bait: his overworked, unsuspecting assistant MacGregor.