"Get up, you damned butcher," ordered Jimmie, "and march upstairs. And just remember that I've got you covered; don't make any false moves." He prodded the prostrate form of the by now glaring fiend before him. The stench of the place was nearly overcoming him, and again he felt an overwhelming desire to dash madly from that den of evil, and once more breathe God's fresh air. Under the stimulus of several shoves the Professor finally won to his feet and stumbled up the stairs. Jimmie was taking no chances and kept the automatic sharply digging into the ribs of his prisoner. The fight, however, seemed temporarily to have been all taken out of the old man, and he made no resistance as the reporter drove him on up to the laboratory. The room he found exactly as he left it. At a word from him Norma Manion came from her hiding place in the horrible room where she had been kept prisoner. With an hysterical scream she fell limply to the floor. The sight of her father's murderer had proved too much for her. Forgetting his prisoner for the moment Jimmie sprang to the girl's side. Kell chose this moment to make a dash for freedom. His footsteps, however, were not as noiseless as he had intended, and O'Hara whirled just in time to see his quarry about to throw open the hall door. Jimmie dove for his gun, only to encounter the Professor's mysterious vial, which, though forgotten, still lay in his pocket. With no time to think, he acted purely upon instinct. His arm drew back and the bottle flew straight for the Professor's head. * * * * * By a miracle the missile missed its mark. Came a shivering crash, as the bottle struck a stud in the massive door. Of a sudden recalling the terrific potency of the contents of that particular bottle, Jimmie gasped in dismay. Norma Manion's safety drove every other thought from his mind. At any cost he must remove her from the proximity of those lethal fumes. Hastily and without a backward glance, he gathered the girl into his arms and dashed into the room where he had first found her. Ascertaining that she had but swooned he placed her gently on the bed. In some perplexity as to his next move he stared at the beautiful face now so wan and white. Queer that he hadn't noticed the fact before--she was beautiful. He even took a second look, then noting a continued absence of all sound from the laboratory decided to investigate. Gingerly he pushed open the door, sniffing the air cautiously as he advanced. To his nostrils gradually came a slight scent, which though almost imperceptible made his senses reel. As he approached the hall door he found the atmosphere heavy with the soporific vapors from the broken vial, and he staggered drunkenly. He gave a start of surprise. On the floor, lying in a grotesque huddle which suggested a most unpleasant possibility, was the inert body of Professor Kell. * * * * *