Mr. Nabokov tells us in "The Waltz Invention" that our salvation today rests on a perfect understanding of the human heart. "The Waltz Invention," written when only a handful of scientists were concerned with atomic possibilities, could have been read as a puzzling, incredible fantasy in those days, but of course today a man like Waltz is at the center of our nightmares. We had better have a realistic understanding especially of a tyrant's heart in our fissionable age, MR. Nabokov says. Salvator Waltz is in possession of an infernal machine. He can operate it at will; and the machine is hidden away from all eye in the symbolical country of which Waltz is a citizen. With the same intricate levels of brilliancy as Vladimir Nabokov's other world acclaimed tales, "The Waltz Invention" write in a play form in 1938, is a classic tragedy and a comedy.