had not been successful. Amusement and chagrin seemed to be
struggling for the mastery, until the former suddenly carried
the day, and he burst into a hearty laugh.

"I wouldn't have the Scotland Yarders know it for the world,"
he cried, dropping into his chair; "I have chaffed them so
much that they would never have let me hear the end of it.
I can afford to laugh, because I know that I will be even with
them in the long run."

"What is it then?" I asked.

"Oh, I don't mind telling a story against myself. That
creature had gone a little way when she began to limp and
show every sign of being foot-sore. Presently she came to a
halt, and hailed a four-wheeler which was passing. I managed
to be close to her so as to hear the address, but I need not
have been so anxious, for she sang it out loud enough to be
heard at the other side of the street, `Drive to 13, Duncan
Street, Houndsditch,' she cried. This begins to look
genuine, I thought, and having seen her safely inside,
I perched myself behind. That's an art which every detective
should be an expert at. Well, away we rattled, and never
drew rein until we reached the street in question. I hopped
off before we came to the door, and strolled down the street
in an easy, lounging way. I saw the cab pull up. The driver
jumped down, and I saw him open the door and stand
expectantly. Nothing came out though. When I reached him he
was groping about frantically in the empty cab, and giving
vent to the finest assorted collection of oaths that ever