“Very rarely,” I answered. “But I am still seeking for traces of the missing man.”

“Curious that he didn’t come back. He seemed quite a nice young fellow and devoted to his wife. There is a mystery somewhere. I wonder what really happened.”

“It is impossible to conjecture—unless he is keeping out of the way for some unexplained reason.”

A moment later the door opened and Dr. Feng walked in. I was rather surprised at his coming up unannounced. When he saw me he looked annoyed for a moment, but only for a moment. Then he laughed and said—

“Well, I didn’t expect to find you here, Yelverton!”

“We were discussing little Mrs. Audley and her missing husband,” Humphreys explained.

“Yes, some silly ass who is jealous has sent Yelverton two letters of warning, threatening him with death if he continues his search for Audley or his acquaintanceship with his wife,” the doctor said.

Humphreys laughed, and exclaimed—

“What rubbish! The letters must be a joke.”

“I think they are meant in earnest,” I said.