Morgan smiled appreciatively, and Tierney went on.

"As I was saying, I watched this girl as she waited for the bus.
Suddenly I glanced toward the house, and there was this guy, Marsh,
standing just inside the doorway. To me it looked as if he was
trying to keep an eye on this girl, without her seeing him if she
looked back. So I kept out of sight as far as I could and watched
the two of them. Sure enough, in about one minute along comes the
bus and the girl gets in. Would you believe it, Morgan, that very
minute Marsh dashes across the street, nails an empty taxi and
starts after the bus."

"Now, I ain't as quick as you, Morgan, but I sure figured that my
cue was to join the procession. Luck was with me, for the minute I
got this idea I spotted a Checker taxi and rushed at it so hard the
driver nearly fainted. 'Follow that Yellow ahead!' I yelled to the
driver, and before he came to a full stop I had jumped in and we
were off."

"We trailed down Sheridan Road, through Lincoln Park, and on to
Michigan Avenue--the girl in the bus, Marsh in the Yellow, and me in
the Checker. Just after we passed Adams Street the Yellow stopped at
the curb and Marsh got out. I stopped my cab quick, and as I saw
that Marsh was paying off his driver, I settled with mine and got
ready for the next move."

"Marsh started down Michigan Avenue, and I could keep pretty close
on account of the crowd. Pretty soon I sighted this girl trotting
along a little way ahead of us. Now, there's a situation for you,
Morgan--Marsh trailing the girl and me trailing Marsh."

At this point Morgan's interest was shown by the fact that he sat
forward in his chair with his elbows on his knees, and for the
moment forgot to pull at his pipe.

Tierney continued. "The girl turns into a building at six hundred
and something Michigan Avenue--I've got the exact number in my book.
Marsh strolls over to the curb, while I, taking advantage of his
back being turned for the moment, shot into the building after her.
She entered an elevator, and I strolled in, too. Luckily, she stood
near the door, so I could get into the back of the car and not be
specially noticed. She got off at a musical school. As we had been
the only two people in the elevator, I took a chance, and said to
the man running it, 'Some looker!'"

"'Yes,' he says, 'a fine looking girl. She comes here twice a
week.'"

"'Well,' says I, 'that's a good thing for women--to learn music. How
long do they t