About here it was that James O'Hara began to realize that this was going to be a horrible night indeed. He had wondered why the progress of the light had been so deathly slow. Now he knew why, by reason of what he saw--and what he saw made him feel rather sick. The man with the lantern was quite plainly Professor Kell, bent nearly double with the weight of a grotesquely big thing on his back, a thing that flung a dim, contorted shadow on the ceiling. And that thing was a dead man. * * * * * A corpse it was--the attitude proved that. With a numb relief O'Hara realized it was not the body of Skip Handlon. This had been a much larger man than Skip, and the clothing was different from anything Handlon had worn. The light was now disappearing down the stairway. For a moment O'Hara felt undecided as to his next move. Should he follow Kell and his burden, or should he not take advantage of this fine opportunity to continue his search of the upper story? That scream still rang in his ears; there had been a very evident feminine quality in it, and the remembrance of that fact reproached him. Had he been guilty of mincing daintily about in this old house while a woman was being done to death under his nose, when a little bolder action on his part might have saved her? Stepping once more into the hall he advanced to the door just closed behind the Professor and tried it, only to find it locked. Out of a pocket came several articles best known to the "profession"--a piece of stiff wire, a skeleton key and other paraphernalia calculated to reduce the obstinate mechanism to submission. For a minute, two, three, he worked at the ancient lock; then, without a creak, the door swung open. A touch of oil to the hinges had insured their silence. Jimmie O'Hara believed in being artistic in his work, especially when it came to fine points, and he was. * * * * * He found himself in the same room where the drugged cigars had been proved the undoing of Handlon and Perry. In order not to alarm the Professor unduly by chance noises and perhaps invite a surprise attack upon himself, O'Hara closed the laboratory door behind him and let the lock spring again. Hastily he made search of the place. No trace of the missing reporter could he find, except two half-consumed cigars in a corner whence the Professor had impatiently kicked them. On the big table in the center of the room, however, was an object which excited his interest. It was apparently nothing more or less than a giant Crookes tube, connected in some way with a complicated mechanism contained in a wooden cabinet under the table. Probably this apparatus was concerned in the Professor's weird experiments which had so aroused the countryside. He studied it curiously, his eyes for the moment closed in thought, until a slight sound somewhere near at hand caused him to open them wide. Was the Kell returning?