"Don't move," he cautioned, "for in these rays we are able to be seen as well as to see. I told you the servants left, but I didn't tell you how. It was that thick-witted housekeeper–who turned on the lights downstairs after I had warned her not to, and the wires picked up sympathetic vibrations. It must have been frightful–I could hear the screams up here in spite of all I was seeing and hearing from another direction, and later it was rather awful to find those empty heaps of clothes around the house. Mrs. Updike's clothes were close to the front hall switch–that's how I know she did it. It got them all. But so long as we don't move we're fairly safe. Remember we're dealing with a hideous world in which we are practically helpless . . . Keep still!"