the League, and the copying of the 'Encyclopaedia,' must be to get
this not over-bright pawnbroker out of the way for a number of
hours every day. It was a curious way of managing it, but,
really, it would be difficult to suggest a better. The method was
no doubt suggested to Clay's ingenious mind by the colour of his
accomplice's hair. The 4 pounds a week was a lure which must draw
him, and what was it to them, who were playing for thousands?
They put in the advertisement, one rogue has the temporary
office, the other rogue incites the man to apply for it, and
together they manage to secure his absence every morning in the
week. From the time that I heard of the assistant having come for
half wages, it was obvious to me that he had some strong motive
for securing the situation."

"But how could you guess what the motive was?"

"Had there been women in the house, I should have suspected a
mere vulgar intrigue. That, however, was out of the question. The
man's business was a small one, and there was nothing in his
house which could account for such elaborate preparations, and
such an expenditure as they were at. It must, then, be something
out of the house. What could it be? I thought of the assistant's
fondness for photography, and his trick of vanishing into the
cellar. The cellar! There was the end of this tangled clue. Then
I made inquiries as to this mysterious assistant and found that I
had to deal with one of the coolest and most daring criminals in
London. He was doing something in the cellar--something which
took many hours a day for months on end. What could it be, once
more? I could think of nothing save that he was running a tunnel
to some other building.