"He felt the presence of the hand of Reginald Clark groping in his brain as if searching for something that had still escaped him. He tried to move, to cry out, but his limbs were paralyzed. When, by a superhuman effort, he at last succeeded in shaking off the numbness that held him enchained, he awoke just in time to see a figure, that of a man, disappearing in the wall that separated Reginald's apartments from his room