"You think I acted rightly in sending for you, Mr. Smith?"

Nayland Smith smoked furiously.

"Mr. Eltham," he replied, "you see in me a man groping in the dark. I am to-day no nearer to the conclusion of my mission than upon the day when I left Mandalay. You offer me a clew; I am here. Your affair, I believe, stands thus: A series of attempted burglaries, or something of the kind, has alarmed your household. Yesterday, returning from London with your daughter, you were both drugged in some way and, occupying a compartment to yourselves, you both slept. Your daughter awoke, and saw someone else in the carriage—a yellow-faced man who held a case of instruments in his hands."

"Yes; I was, of course, unable to enter into particulars over the telephone. The man was standing by one of the windows. Directly he observed that my daughter was awake, he stepped towards her."

"What did he do with the case in his hands?"

"She did not notice—or did not mention having noticed. In fact, as was natural, she was so frightened that she recalls nothing more, beyond the fact that she strove to arouse me, without succeeding, felt hands grasp her shoulders—and swooned."

"But someone used the emergency cord, and stopped the train."

"Greba has no recollection of having done so."

"Hm! Of course, no yellow-faced man was on the train. When did you awake?"

"I was aroused by the guard, but only when he had repeatedly shaken me."