Presently the young man pulled out his watch, fumbled for a match-box, struck a light, and groaned as he read the time.

At the sound of the match striking, the young lady turned her head. Then, as the bright flame illuminated the young man’s face, she sat bolt upright, dropping the muff to her lap with a cry of dismay.

He looked up at her. The match burned his fingers; he dropped it and hurriedly lighted another; and the flickering radiance brightened upon the face of a girl whom he had never before laid eyes on.

“Good heavens!” he said. “Where’s my sister?”

The young lady was startled, but resolute. “You have made a dreadful mistake,” she said; “you are in the wrong cab—”

The match went out; there came a brief moment of darkness, then the cab turned a corner, and the ghostly light of electric lamps played over them in quivering succession.

“Will you please stop this cab?” she said, unsteadily. “You have mistaken my cab for yours. I was expecting my brother.”

Stunned, he made no movement to obey. A sudden thrill of fear passed through her.

“I must ask you to stop this cab,” she faltered.

The idiotic blankness of his expression changed to acute alarm.