“Then let us go arrest him.”

“I expect him here every instant.”

“But why should he come?”

“Because I have written and asked him.”

“But this is incredible, Mr. Holmes! Why should he come because you have asked him? Would not such a request rather rouse his suspicions and cause him to fly?”

“I think I have known how to frame the letter,” said Sherlock Holmes. “In fact, if I am not very much mistaken, here is the gentleman himself coming up the drive.”