"Undoubtedly Grantham meant to retrieve it later on, and undoubtedly he would have refused ever to give out any information or any demonstrations of his invisibility-method, by saying that he would take no chances on loosing another invisible criminal on the world. Gray would never have been found, and would then have been believed always the unseen criminal. Almost Grantham won, and would have won had not that one routine and unthinking step of mine defeated him. Yet he must have known, too, that there was always a chance of losing, for when I came out this morning after telling him over the phone to be waiting here for some new information I was bringing, he had the cyanide with him. And the rest--you saw how he took his one way out." When Wade had finished Carton and Ellsworth gazed at him across the sunlit laboratory, spellbound. It was Carton who at last found his voice. "And we never guessed--we never dreamed--that there was never any Invisible Master!" Wade was looking thoughtfully out of the window. "Did I say there wasn't? I think I was wrong in that, after all--I think there was an Invisible Master whose hand has lain heavy on New York for these last days. Fear!--the fear that Grantham loosed on the city for his own ends, the fear that stalked its ways and was by day and night its unseen lord! It was that that was the true Invisible Master!" THE END