The beast, rearing on hind legs, sprang at her throat and felled her. She lay prone on the ground, the dog crouching over her with jaws slavering and forefeet pawing her body. Helen stood motionless in her tracks. The dog’s eyes and teeth gleamed menacingly in the moonlight, and she knew that the slightest move would precipitate an attack upon her. Her mind, clearing rapidly under the stress of danger, was seeking a way out of the predicament when hurried footsteps came down the walk.

“Cæsar!” called a gruff voice.

The dog let go its hold as a man came running toward them. He stopped and gathered the fallen woman in his arms, and Helen recognized the individual who had met her at the gate on her arrival. With scarcely a glance in her direction, he turned and walked toward the house with his burden. Helen feeling the gleaming eyes of the beast on her face, dared not move. As she stood wondering what to do, a shadow fell across the graveled walk and a second man came toward her.

“Back to your kennel, Cæsar!” he commanded, and the dog obediently slunk away. “Excellent watchdog, but a bit ferocious when he is kept on half rations. Won’t you come inside, Miss—er, Hardwick? Hawkes told me about you. I am Mr. Slade. Sorry to have kept you waiting.”

His manner and appearance were pleasant enough; yet Helen felt an impulse to run. The things she had seen and heard since coming to Azurecrest were highly mystifying, and they had left a number of questions and suspicions in her mind. She glanced quickly toward the picket fence, then in the direction whence Cæsar had disappeared. Something told her that a whistle would set the dog snapping and snarling at her heels if she should try to break away. She decided that her hope lay in diplomacy rather than flight.

As if he had read her thoughts, Slade touched her arm and escorted her to the house. She sensed that a trying ordeal was ahead of her, and she was already steeling her nerves for it. She had faced danger many times, and her buoyant nature always responded to the demands of a crisis with a quickening of wits and rising courage.

“I trust Miss Neville didn’t annoy you” murmured Slade apologetically as he opened the door and conducted her down the hall. “A very difficult case of paranoia. She gets quite violent at times, and she is subject to all sorts of hallucinations. To-night she broke away from her nurse and would no doubt have attempted to scale the fence if Cæsar hadn’t interrupted her.”

Helen walked beside him in silence. She had already wondered whether Miss Neville could be quite sane. Oddly enough, Slade’s words almost convinced her that the woman was of sound mind, though perhaps she was suffering from the effects of illness and shock. Helen had conceived an immediate and instinctive distrust of Slade, despite his smooth-flowing speech and suave manners.

He ushered her into the same room she had left so hurriedly upon hearing the laughter, and placed a chair for her. A look at his face in the electric light gave edge to her misgivings, but at first she could not tell what there was about him that repelled her. According to all standards, he should have attracted her and inspired confidence in her. His personality contained that blend of strength and gentleness which she had liked in men ever since her days of inconsequential hero worship. He had the strong jaw and high forehead that often go with aggressiveness and mental keenness, and he carried his tall figure with the easy grace of a man of the world. His presence would have been quite magnetic if only—— But Helen could not finish the thought. There was an unnamable something about him that eluded her mental grasp.

“Quite a sad case, that of Miss Neville,” he continued. “She was once a very brilliant woman, but her genius was consumed by its own fire, so to speak. I might as well tell you that she is my half-sister. For her own good and to avoid unpleasant notoriety, I am keeping her here under the care of a physician. Her friends believe that she is traveling abroad, and so far I have succeeded in keeping the true state of affairs secret. There is a possibility, though a very remote one, that she will recover.”