"No use talking about that now," Duvall remarked, shortly. "I want to drive there at once. Get on the box, with the chauffeur, and point out the place to him."
"Yes, sir." A moment later they had started on their way uptown.
Knowing as he did Grace's impetuous nature, Duvall could only conclude that her pursuit of the woman had led her into some trap. What danger she might at this moment be facing, he could only surmise. The apartment building, when they finally reached it, presented a grim and forbidding appearance. Not a light broke the darkness of any of its windows. The drug store on the opposite corner, too, was closed for the night. The whole locality was dark and silent.
"There's the place, sir," Leary exclaimed, as they drew up to the corner.
"Tell the driver to stop a few doors up the block—not right in front of the building."
Leary nodded. Presently the cab stopped, and he and Duvall got out.
The detective's first move was to ascertain whether or not the building had any rear exit, by which Grace might have left, without being seen by Leary. He walked down the avenue to its rear wall, only to find that it abutted against the wall of the next building. There was no rear entrance.
If, then, Grace had not left the place during the past hour, she must still be in one of the ten flats that formed the five floors of the building. But which one? That, apparently, was the problem he had to solve.
It would be useless, he felt, to inquire at the doors of the various apartments at this hour of the morning. Admission, at least on the part of those he sought, would certainly be refused. Yet he felt that there was no time to be lost.
Stationing Leary before the front door, with instructions to keep a careful watch, Duvall went into the vestibule, and by means of his pocket light, inspected the names of the occupants of the building, as Grace had done a short time before. The hallway inside was dark, with the exception of a dim light at the foot of the stairs. Apparently the place boasted no elevator or hall-boy service.