Bethel turned his eyes toward the doctor, and said, eagerly:

"Why did you call him Bathurst?"

"Did I?" said the old man, testily. "It was a slip of the tongue."

The patient turned his head and looked from one to the other, eagerly. Then he addressed me:

"If you will answer me one question, I promise not to ask another until you are prepared to explain."

"Ask it," I replied.

"Are you a detective?"

"Yes."