"Then how did you learn? You certainly must have discovered something?"
The detective suddenly started and bent forward in a listening attitude.
"What is the matter, sir?" demanded Mr. Townsend.
"You have not kept faith with me, I fear," said Jack, in a tone of well-assumed sternness.
"I have not?"
"So it would appear."
"What do you mean?"
"There is some one in the adjoining room."
"Not to my knowledge."
"I heard a footstep."