"Not voluntarily, I'm afraid," he growled morosely. "I've still a little respect for medical ethics, but if ever a case--" His voice trailed into silence as from somewhere in the dawn sounded the wail of a siren. "There's the ambulance," he finished. Pat sat unmoving as the sounds from outdoors detailed the stopping of the vehicle before the house. She heard the Doctor descending the steps, and the creak of the door. Though it took place before her eyes, she scarcely saw the white-coated youths as they lifted the form of Nicholas Devine and bore it from the room on a stretcher, treading with carefully broken steps to prevent the swaying of the support. Dr. Horker's order to follow made no impression on her; she sat dully on the couch as the chamber emptied. Why, she wondered, had the thought of Nick's death disturbed her so? Wasn't it but a short time since they had both contemplated it? What had occurred to alter that determination? Nick was dying, she thought mournfully; all that remained was for her to follow. There on the floor lay the revolver, and on the table, glistening in the wan light, reposed the untouched lethal draft. That was the preferable way, she mused, staring fixedly at its glowing contour. But suppose Nick weren't to die--she'd have abandoned him to his terrible doom, left him to face a situation far more ominous than any unknown terrors beyond death. She shook her head distractedly, and looked up to meet the eyes of Dr. Horker, who was watching her gravely in the doorway. "Come on, Pat," he said gently. She rose, followed him down the stairs and out into the morning light. The driver of the ambulance stared curiously at her dishevelled, bedraggled figure, but she was so weary and forlorn that even the effort of brushing away the black strands of hair that clouded her smoke-dark eyes was beyond her. She slumped into the seat of the Doctor's car and sighed in utter exhaustion. "Rush it!" Horker called to the driver ahead. "I'll follow you." The car swept into motion, and the swift cool morning air beating against her face from the open window restored some clarity to her mind. She fixed her eyes on the rear of the speeding vehicle they followed. "Is there any hope at all?" she queried despondently. "I don't know, Pat. I can't tell yet. When you closed your eyes, he half turned, dodged; the bullet entered his skull near the base, near the cerebellum. If it had pierced the cerebellum, his heart and breathing must have stopped instantly. They didn't, however, and that's a mildly hopeful sign. Very mildly hopeful, though." "Do you know now what that devil--what the attack was?" "No, Pat," Horker admitted. "I don't. Call it a devil if you like; I can't name it any better." His voice changed to a tone of wonder. "Pat, I can't understand that paralyzing fascination the thing exerted. I--any medical man--would say that mental dominance of that sort doesn't exist." "Hypnotism," the girl suggested.