You have asked for my advice, and I give you my advice. Tear up your letter of introduction, and don't stir a step further in the direction of Whitehall. Mr. Troy began to understand. Fortunately for the detective department, the public in general forgets what it reads. Go to your club, and look at the criminal history of our own time, recorded in the newspapers.
Every crime is more or less a mystery.
I don't charge the police with neglecting their work. No doubt they do their best, and take the greatest pains in following the routine to which they have been trained. But those men have died, or have retired. One of them would have been invaluable to you in the case you have just mentioned to me. As things are, unless you are wrong in believing in the young lady's innocence, the person who has stolen that bank-note will be no easy person to find.