"I am not unacquainted with the ingenious methods of Scotland Yard," was the reply. "I can see Merrington working it out with a scale map of London to help him. He is convinced that Nepcote is still in London without a penny in his pockets. Merrington asks himself what Nepcote is likely to do in such circumstances? Borrow from his friends or attempt to cash a cheque? We will guard against that by watching his clubs and his bank. Raise funds on the necklace--if he has it? Merrington knows how to stop that by warning the pawn-brokers and jewellers. When he has done so he has the satisfaction of feeling that his man is cut off from supplies, wandering penniless in stony-hearted London, as helpless as a babe in the wood. Where will he hide? He is a West End man, knowing little of London outside of Piccadilly, so the chances are that he will not get very far, and that his wanderings will end in surrender or starvation. But Scotland Yard cannot wait for him to surrender, and Merrington, with an imagination stimulated by the necessity of finding him, decides in favour of Islington--the so-called Merry Islington of obsequious London chroniclers, though, so far as my personal observation goes, its inhabitants are merry only when in liquor. Islington is congested, Islington contains criminals, and Islington is an ideal hiding-place. Therefore, says Merrington, let us seek our man there." "Oh, come, Mr. Colwyn, you don't put me off like that. Somebody must have told you that I was out there to-day." "I saw you myself. As a matter of fact, I have been looking for Nepcote in that part of London--in an area between Farringdon Street and Euston." "Why there in particular? London is a wide field." "I have endeavoured to narrow it by considering the possibilities. The suburbs are unsafe, and so is the West End; the City affords no shelter for a fugitive. There remain the poorer congested areas, the docks, and the East End. But that does not help us very much, because there is still a vast field left. What narrowed it considerably for me is my strong belief, taking all the circumstances into consideration, that Nepcote has not got very far from where we last saw him. What finally determined me to select Islington as a starting point for my search was that strange law of human gravitation which impels a fugitive to seek a criminal quarter for shelter. A hunted man seems to develop a keen scent for those who, like himself, are outside the law. Islington, as you are aware, has a large percentage of criminals in its population. At any rate, I am looking for Nepcote in Islington." "Although I could pick flaws in your theory, I am bound to say that you are right," said Caldew. "Nepcote is hiding in Islington. At least, we think so," he cautiously added. "Good! How did you find out?" Caldew gave his companion particulars of the pawnbroker's visit to Scotland Yard that morning.