"Only to ask if the murderer was known; whether the passengers had
been detained; whether there was any inquiry in progress; and
then--"

"What then?"

"This gentleman," pointing to Block, "came out, accompanied by
another. They passed pretty close to us, and I noticed that the
lady slipped quickly on one side."

"She recognized her confederate, of course, but did not wish to be
seen just then. Did he, the person with Block here, see her?"

"Hardly, I think; it was all so quick, and they were gone, in a
minute, to the cab-stand."

"What did your woman do?"

"She seemed to have changed her mind all at once, and declared she
would not wait for her friends. Now she was in quite a hurry to
go."

"Of course! and left you like a fool planted there. I suppose she
took a cab and followed the others, Block here and his companion."

"I believe she did. I saw her cab close behind theirs."

"It is too late to lament this now," said the Chief, after a short
pause, looking at his colleagues. "At least it confirms our ideas,
and brings us to certain definite conclusions. We must lay hands