I glanced towards him in amazement.

“If the girl does not turn up of her own accord, or if we do not succeed in getting some trace of her movements, I shall be tempted to place you where you can study into the ways of this gentleman’s household. If the affair is a mystery, it has its centre in that house.”

I stared at Mr. Gryce good and roundly. “You have come across something which I have missed,” observed I, “or you could not speak so positively.”

“I have come across nothing that was not in plain sight of any body who had eyes to see it,” he returned shortly.

I shook my head slightly mortified.

“You had it all before you,” continued he, “and if you were not able to pick up sufficient facts on which to base a conclusion, you mustn’t blame me for it.”

More nettled than I would be willing to confess, I walked back with him to the station, saying nothing then, but inwardly determined to reestablish my reputation with Mr. Gryce before the affair was over. Accordingly hunting up the man who had patrolled the district the night before, I inquired if he had seen any one go in or out of the side gate of Mr. Blake’s house on ——- street, between the hours of eleven and one.

“No,” said he, “but I heard Thompson tell a curious story this morning about some one he had seen.”

“What was it?”

“He said he was passing that way last night about twelve o’clock when he remarked standing under the lamp on the corner of Second Avenue, a group consisting of two men and a woman, who no sooner beheld him than they separated, the men drawing back into Second Avenue and the woman coming hastily towards him. Not understanding the move, he stood waiting her approach, when instead of advancing to where he was, she paused at the gate of Mr. Blake’s house and lifted her hand as if to open it, when with a wild and terrified gesture she started back, covering her face with her hands, and before he knew it, had actually fled in the direction from which she had come. A little startled, Thompson advanced and looked through the gate before him to see if possible what had alarmed her, when to his great surprise, he beheld the pale face of the master of the house, Mr. Blake himself, looking through the bars from the other side of the gate. He in his turn started back and before he could recover himself, Mr. Blake had disappeared. He says he tried the gate after that, but found it locked.”