the establishment until Tuesday night.
All turns upon my securing the same apartment. If I am unable to do so,
the arrangements for the raid will have to be postponed. Opium smokers
are faddists essentially, however, and I think I can manage to pretend
that I have formed a strange penchant for this particular cubiculum"...

"By whom were you introduced to the place?" asked Dunbar, leaning back
against the table and facing the Frenchman.

"That I cannot in honor divulge," was the reply; "but the representative
of Mr. King who actually admitted me to the establishment is one
Gianapolis; address unknown, but telephone number 18642 East. Make a
note of him, that Gianapolis."

"I'll arrest him in the morning," said Sowerby, writing furiously in his
notebook.

"Nom d'un p'tit bonhomme! M. Sowerby, you will do nothing of that
foolish description, my dear friend," said Max; and Dunbar glared at the
unfortunate sergeant. "Nothing whatever must be done to arouse suspicion
between now and the moment of the raid. You must be circumspect--ah,
morbleu! so circumspect. By all means trace this Mr. Gianapolis; yes.
But do not let him SUSPECT that he is being traced"...

XXXV

TRACKER TRACKED

Helen Cumberly and Denise Ryland peered from the window of the former's
room into the dusk of the Square, until their eyes ached with the strain
of an exercise so unnatural.

"I tell you," said Denise with emphasis, "that... sooner or later... he
will come prowling... around. The mere fact that he did not appear...
last night... counts for nothing. His own crooked... plans no doubt
detain him... very often... at night."

Helen sighed wearily. Denise Ryland's scheme was extremely distasteful
to her, but whenever she thought of the pathetic eyes of Leroux she
found new determination. Several times she had essayed to analyze the
motives which actuated her; always she feared to pursue such inquiries
beyond a certain point. Now that she was beginning to share her friend's
views upon the matter, all social plans sank into insignificance, and
she lived only in the hope of again meeting Gianapolis, of tracing out
the opium group, and of finding Mrs. Leroux. In what state did she
hope and expect to find her? This was a double question which kept her
wakeful through the dreary watches of the night....

"Look!"

Denise Ryland grasped her by the arm, pointing out into the darkened
Square. A furtive figure crossed from the northeast corne