The light here was still too dim to reveal her face, but her figure was slight and her voice was of singular sweetness.

“I have saved your life, Victor Sandoff,” she said to him, “and at great peril to my own, as you will believe. Some day I may exact a similar favor of you. Will you grant it if that time ever comes?”

Sandoff was influenced by the tinge of romance that invested the situation. He was deeply grateful to the woman who had saved him, so he readily promised to grant whatever she might ask him.

“Swear it!” she said, and without hesitation he took the required oath.

Then she led him by more than one barred and bolted gate to a street on the canal bank, and left him there, vanishing without a word and as mysteriously as she had come. He knew his surroundings, and quickly made his way to the nearest police bureau, gathered a force of officers, and returned as speedily as possible to the house from which he had just escaped. All was quiet there. Sandoff’s four men were found lying in the hallway, bound and gagged, and all of them more or less severely wounded. The Nihilists, who had no doubt taken alarm on discovering Sandoff’s escape, had fled from the house, and disappeared in the mazes of the great city.

It was a year ago that these things had happened, and though Sandoff made diligent inquiry through his men as to the identity and whereabouts of the girl—for he was convinced that she must be very young—he never discovered the slightest trace of her. Tonight, under the fragrant influence of his cigar—which may have been stronger than usual—he found himself wondering vaguely if the fulfillment of his oath would ever be exacted, and trying to recall the girl as she appeared to him that night.

From this train of reveries he was aroused by footsteps in the hall. Then came a sharp rap on the door. As the command to enter left Sandoff’s lips Serge Zamosc stepped into the room, followed by a short thick set man, muffled to his ears in a great coat. Zamosc’s manner gave evidence of excitement. He glanced at Sandoff, and then turned to his companion, who stood awkwardly in the center of the floor with his eyes downcast and his hands pulling nervously at his fur coat.

“This is the Honorable Inspector,” he cried impatiently. “Now speak! Tell him what you know. If you have brought me here for nothing, it will fare ill with you.

“I found this fellow in the street a few moments ago,” he added to Sandoff. “He insisted that he had something of importance to communicate, and as he would have nothing to say to me, but insisted on seeing you, I thought it best to let him have his way. Possibly he brings some news bearing on the Shamarin affair.”

Sandoff turned to the man, whose dress and appearance showed him to belong to the lower classes.