he sky was overcast and clouds of dense black smoke
rolled together from the two sides of the city and met over their heads.

"It's from the steel mills," Mr. Emerson explained as he advised Ethel
Brown to wipe off a smudge of soot that had settled on her cheek and
warned his daughter that if she wanted to preserve the whiteness of her
gloves she had better replace them by colored ones until she returned to
a cleaner place.

They were to take the afternoon train up the Monongahela River to the
town from which Stanley Clark had sent his wire telling his uncle that
"Emily Leonard married a man named Smith," but there were several hours
to devote to sightseeing before train time, and the party went over
Schenley Park with thoroughness, investigated several of the "inclines"
which carried passengers from the river level to the top of the heights
above, motored among the handsome residences and ended, on the way to
the station, with a flying visit to the old blockhouse which is all that
is left of Port Pitt.

"So this is really a blockhouse," Helen said slowly as she looked at the
little two story building with its heavy beams.

"There are the musket holes," Ethel Brown pointed out.

"This is really where soldiers fought before the Revolution!"

"It really is," her mother assured her. "It is in the care of one of
the historical societies now; that's why it is in such good condition."

Roger had secured the tickets and had telephoned to the hotel at
Brownsville for rooms so they took their places in the train with no
misgivings as to possible discomfort at night. Their excitement was
beginning to rise, however, for two reasons. In the first place they had
been quite as disturbed as Dorothy and her mother over the difficulties
attending the purchase of the field and the Fitz-James Woods, and the
later developments in connection with the man, Hapgood. Now that they
were approaching the place where they knew Stanley Clark was working out
the clue they began to feel the thrill that comes over explorers on the
eve of discovery.

The other reason for excitement lay in the fact that Mr. Emerson had
promised them some wonderful sights before they reached their
destination. He had not told them what they were, although he had
mentioned something about fairyland that had started an abundant flow of
questions from Dicky. Naturally they were all alert to find out what
novelty their eyes were to see.

"I saw one novelty this aft