of physical characteristics by no means to be confused with those of
the man with the twisted mouth--who, negligently handing a bill to the
chauffeur, ran nimbly up the steps, rang the door-bell, and promptly
letting himself into the vestibule, closed the door behind him.

The taxicab swung round and made off. Not so P. Sybarite. Profoundly
intrigued, he waited hopefully for this second midnight caller to
reappear, as baffled as himself. But though he dawdled away a patient
five minutes, nothing of the sort occurred. The front doors remained
closed and undisturbed, as little communicative as the darkened
windows.

Here was mystery within mystery, indeed! The circumstances annoyed P.
Sybarite intensely. And why (he asked himself, with impatience) need
he remain outside when another entered without let or hindrance?

Upon this thought he turned boldly up the steps, pressed the
bell-button; laid hold of the door-knob, and entered into a vestibule
as dark as his bewilderment and as empty as the palm of his hand;
proving that the young gentleman of fashion had experienced no
difficulty in penetrating farther into fastnesses of this singular
establishment. And reflecting that where one had gone, another might
follow, P. Sybarite pulled the door to behind him.

Instantly the bare and narrow vestibule was flooded with the merciless
glare of half a dozen electric bulbs; and at the same time he found
himself sustaining the intent scrutiny of a pair of inhospitable dark
eyes set in an impassive dark face--this last abruptly disclosed in
the frame of a small grille in one of the inner doors.