At last Gregory Hall's calm was disturbed. He looked at Fleming Stone as at a supernatural being. And small wonder. For the truth of Stone's statements was evident from Hall's amazement at them.

"You - you saw us!" he gasped.

"No, I didn't see you; it is merely a matter of observation, deduction, and memory. You recollect the muddy shoes?" he added, turning to me.

Did I recollect! Well, rather! And it certainly was a coincidence that we had chanced to examine those shoes that morning at the hotel.

As for Mr. Randolph and the district attorney, they were quite as much surprised as Hall.

"Can you prove this astonishing story, Mr. Stone?" asked Mr.

Goodrich, with an incredulous look.

"Oh, yes, in lots of ways," returned Stone. "For one thing, Mr.

Hall has in his pocket now a letter from the young lady. The whole matter is of no great importance except as it proves Mr.

Hall was not in West Sedgwick that night, and so is not the murderer."

"But why conceal so simple a matter? Why refuse to tell of the episode?" asked Mr. Randolph.

"Because," and now Fleming Stone looked at Hall with accusation in his glance - " because Mr. Hall is very anxious that his fiancee shall not know of his attentions to the young lady in Brooklyn."

"O-ho!" said Mr. Goodrich, with sudden enlightenment. "I see it all now. Is it the truth, Mr. Hall? Did you go to Brooklyn and back that night, as Mr. Stone has described?"

Gregory Hall fidgeted in an embarrassed way. But, unable to escape the piercing gaze of Stone's eyes, he admitted grudgingly that the detective had told the truth, adding, "But it's wizardry, that's what it is! How could he know?"

"I had reason for suspicion," said Stone; "and when I found you were deaf in your right ear, and that you had in your pocket a letter addressed in a feminine hand, and postmarked `Brooklyn,' I was sure."

"It's all true," said Hall slowly. "You have the facts all right. But, unless you have had me shadowed, will you tell me how you knew it all?"

And then Fleming Stone told of his observations and deductions when we noticed the muddied shoes at the Metropolis Hotel that morning.

"But," he said, as he concluded, "when I hastily adjudged the young lady to be deaf in the left ear, I see now I was mistaken.

As soon as I realized Mr. Hall himself is deaf in the right ear, especially so in damp or wet weather, I saw that it fitted the case as well as if the lady had been deaf in her left ear. Then a note in his pocket from a lady in Brooklyn made me quite sure I was right."

"But, Mr. Stone," said Lawyer Randolph, "it is very astonishing that you should make those deductions from those shoes, and then come out here and meet the owner of the shoes."

"It seems more remarkable than it really is, Mr. Randolph," was the response; "for I am continually observing whatever comes to my notice. Hundreds of my deductions are never verified, or even thought of again; so it is not so strange that now and then one should prove of use in my work."

"Well," said the district attorney, "it seems wonderful to me.

But now that Mr. Hall has proved his alibi, or, rather, Mr. Stone has proved it for him, we must begin anew our search for the real criminal."

"One moment," said Gregory Hall. "As you know, gentlemen, I endeavored to keep this little matter of my going to Brooklyn a secret. As it has no possible bearing on the case of Mr.

Crawford, may I ask of you to respect my desire that you say nothing about it?"

"For my part," said the district attorney, "I am quite willing to grant Mr. Hall's request. I have put him to unnecessary trouble and embarrassment by having him arrested, and I shall be glad to do him this favor that he asks, by way of amends."

But Mr. Randolph seemed reluctant to make the required promise, and Fleming Stone looked at Hall, and said nothing.

Then I spoke out, and, perhaps with scant courtesy, I said:

"I, for one, refuse to keep this revelation a secret. It was discovered by the detective engaged by Miss Lloyd. Therefore, I think Miss Lloyd is entitled to the knowledge we have thus gained."

Mr. Randolph looked at me with approval. He was a good friend of Florence Lloyd, and he was of no mind to hide from her something which it might be better for her to know.

Gregory Hall set his lips together in a way which argued no pleasant feelings toward me, but he said nothing then. He was forthwith released from custody, and the rest of us separated; having arranged to meet that evening at Miss Lloyd's home to discuss matters.