So in Wysocki’s heroic (if not obsessional) quest for the secret of the wonderful titular invention, which was held as a secured secret by Heinlein even to his death and beyond, he delves into naval and related technological history; tracks down as many of Heinlein’s classmates as remain alive; seeks documents from official archives (and is predictably given the runaround); writes his investigation up for the Naval journal Shipmate after scouring the collection of back issues held in the Special Collections and Archives Department of the Nimitz Library at the Naval Academy; and requests instruction by informed readers. None of this provided any definitive clues. Even Robert’s widow Ginny, whom Wysocki interviewed, could add nothing. . . .Whether or not readers find his arguments ultimately convincing, let alone worth pursuing at this length and in such fine-grained detail (although I hope nobody goes to this amount of effort in tracking van Vogt’s “sevagram,” say), Dr. Wysocki has produced a complex and strange pudding. Bon appétit!