Puzzled and annoyed, Glover stood trying to recall the mysterious appearance. He walked back to where he had seen the woman, stood where he had stood and looked where he had looked. She had not seemed to withdraw, as he recalled: the curtains had not closed before the head; it had vanished. The wind sung fine, very fine through the copper screens, the Pintsch light flowed very low into the bright globe, the curtains swung again gracefully to the dip of the car; but the head was gone. A discussion threw no light on the mystery. On one point, however, Conductor O'Brien was firm. While the conductor and the porter kept up the talk, Glover resumed his preparations for retiring in the stateroom, but O'Brien interfered. "Don't do it. Don't you do it. I wouldn't sleep in that room now for a thousand dollars." "Nonsense." "That's all right. I say come forward." They made him up a corner in the smoking-room of the 'Frisco car, and he could have slept like a baby had not the conviction suddenly come upon him that he had seen Gertrude Brock. Should he, after all, see her again? And what did it mean? Why was she looking in terror into his stateroom? CHAPTER XII A SLIP ON A SPECIAL Glover's train pulled into Medicine Bend, in the rain, at half-past two o'clock. The face in the Lalla Rookh had put an end to thoughts of sleep, and he walked up to his office in the Wickiup to work until morning on his report. He lighted a lamp, opened his desk with a clang that echoed to the last dark corner of the zigzag hall, and, spreading out his papers, resumed the figuring he had begun at Wind River station. But the combinations which at eleven o'clock had gone fast refused now to work. The Lalla Rookh curtains intruded continually into his problems and his calculations dissolved helplessly into an idle stare at a jumble of figures. He got up at last, restless, walked through the trainmaster's room, into the despatcher's office, and stumbled on the tragedy of the night. It came about through an ambition in itself honorable--the ambition of Bud Cawkins to become a train-despatcher. Bud began railroading on the Wind River. In three months he was made an agent, in six months he had become an expert in station work, an operator after a despatcher's own heart, and the life of the line; then he began looking for trouble. His quest resulted first in the conviction that the main line business was not handled nearly as well as it ought to be. Had Bud confided this to an agent of experience there would have been no difficulty. He would have been told that every agent on every branch in the world, sooner or later, has the same conviction; that he need only to let it alone, eat sparingly of brain food, and the clot would be sure to pass unnoticed.