Quickly he extinguished the lamp and glided to a nearby door, thinking to secrete himself here, and take Kell by surprise. To his consternation the door swung inward at a touch. He prepared instinctively for battle against any foe who might present himself. For a moment he held himself taut; then, nothing of an alarming nature having happened, he drew a swift breath of relief and flashed on his light. He gave vent to a low exclamation. The swiftly darting shaft from the torch had revealed the figure of a girl, bound and gagged. * * * * * The girl lay trembling on a wretched bed in a corner of the dilapidated old chamber. O'Hara crossed the room and bent over her. Still wary of a trap he glanced back in the direction of the laboratory door: all safe there. Jimmie made haste to remove the cruel gag from her mouth. "Courage," he whispered. "Half a minute and you will be free." He produced a knife with a suspiciously long blade and cut her bonds. He then assisted her to her feet, where she reeled dizzily. Realizing the need for fast action he made her sit down while he massaged the bruised arms and ankles, which were badly swollen from the tight ropes. The girl had apparently been in the grip of such terrible fright that she had temporarily lost her power of speech. Mentally he chalked up another score against the Professor as the girl made several ineffectual attempts to speak. "Easy, kid," Jimmie whispered. "Just sit tight, and when you feel able you can tell me all about it. I'm going to get him good for this, you can bank on that." She thanked him with a faint smile, and of a sudden she found her voice. "Who are you? Where is father? Oh, tell me, please! I am afraid that horrible man has murdered him. Are you a servant here? Oh, I don't know whom to trust." "My name is Jimmie O'Hara," replied the reporter briefly; "and I hope you won't worry about me. I am gunning for the Proff myself. Tell me as quickly as you can what you know about him." He still kept an eye on the door of the adjoining laboratory. Any moment he expected to hear the sound of the old man's approach. The room would make an ideal place to ambush the maniac, he had swiftly decided. "I am Norma Manion. Please don't delay, but see if you can locate father." The girl's voice was agonized. "I heard him groan a half-hour ago, and a little later came a terrific crash. Oh, I'm afraid he's dead!" * * * * * Reluctantly Jimmie gave up the idea of ambushing the Professor. "Wait here," he commanded curtly. "If you hear a shot join me as soon as you can. I want to take him alive if I can, but...." With this parting hint he disappeared through the door into the laboratory. Down the carpeted hall he crept to the stairway. Here he stopped and listened, but to his sensitive ears came no sound from below. "Must have gone down the cellar with the body," he muttered. "Here goes for a general exploration."