“I understand,” said Cayley, “that Robert spent his whole life asking for hands.”

The inspector nodded.

“I know that sort. Well, now, we’ll go on to this morning. This letter that Mark got⁠—did you see it?”

“Not at the time. He showed it to me afterwards.”

“Any address?”

“No. A half-sheet of rather dirty paper.”

“Where is it now?”

“I don’t know. In Mark’s pocket, I expect.”

“Ah!” He pulled at his beard. “Well, we’ll come to that. Can you remember what it said?”