Nayland Smith wandered aimlessly about the library.
"I am sorry to have to press you, Mr. Eltham," he said, "but what was the nature of the warning to which you referred, and from whom did it come?"
Mr. Eltham hesitated for a long time.
"I have been so unfortunate," he said at last, "in my previous efforts, that I feel assured of your hostile criticism when I tell you that I am contemplating an immediate return to Ho-Nan!"
Smith jumped round upon him as though moved by a spring.
"Then you are going back to Nan-Yang?" he cried. "Now I understand! Why have you not told me before? That is the key for which I have vainly been seeking. Your troubles date from the time of your decision to return?"
"Yes, I must admit it," confessed the clergyman diffidently.
"And your warning came from China?"
"It did."
"From a Chinaman?"