The Uttermost Farthing

After the visit of the detective, I was rather at a loose end. That unknown wretch was still at large. He had to be found and I had to find him since the police could not. But how? That detective had completely upset my plans and, for a time, I could think of no other. Then came the dirty rascal who had tried to murder me in the chalk-pit; and from his mongrel jargon, half cockney, half foreign, I had gathered a vague hint. If I could not entice the criminal population into my domain, how would it be to reconnoiter theirs?