A cross breeding of science-fiction, political moralizing and old-fashioned fantasy has produced this tale of Gumption Island, a former summer resort blasted by a new type Russian bomb, back into the prehistoric era. The inhabitants, however, maintain their modern attributes. The resident banker tries to set up a new bank (in which he is to have controlling interest) and to take the island by force. The local dentist continues to fill teeth with makeshift tooth-filler. The local lads and maidens struggle with a woman-shortage problem (which even threatens the racial barriers of this Southern resort). New businesses are set up. Father Brown continues to guide his flock ""as usual"". Citizens take turns is such enterprises as the Dinosaur Patrol, designed to keep marauders out of people's back yards. And discussions of Gumptionese politics and theories slow down the book and take it out of the ""light reading"" class where it belongs.