“Is that really so, sir?” exclaimed the astonished detective. “Well, you haven’t let the grass grow under your feet. Ah!” as a gentle rap at the door was heard, “here’s Belfield, I suppose.”

It was Belfield—accompanied by his wife—and mightily disturbed they were when their eyes lighted on our visitor.

“You needn’t be afraid of me, Belfield,” said Miller, with ferocious geniality; “I am not here after you.” Which was not literally true, though it served to reassure the affrighted ex-convict.

“The superintendent dropped in by chance,” said Thorndyke; “but it is just as well that he should hear what passes. I want you to look at this handkerchief and tell me if it is yours. Don’t be afraid, but just tell us the simple truth.”

He took the handkerchief out of a drawer and spread it on the table; and I now observed that a small square had been cut out of one of the bloodstains.

Belfield took the handkerchief in his trembling hands, and as his eye fell on the stamped name in the corner he turned deadly pale.

“It looks like mine,” he said huskily. “What do you say, Liz?” he added, passing it to his wife.

Mrs. Belfield examined first the name and then the hem. “It’s yours, right enough, Frank,” said she. “It’s the one that got changed in the wash. You see, sir,” she continued, addressing Thorndyke, “I bought him half-a-dozen new ones about six months ago, and I got a rubber stamp made and marked them all. Well, one day when I was looking over his things I noticed that one of his handkerchiefs had got no mark on it. I spoke to the laundress about it, but she couldn’t explain it, so as the right one never came back, I marked the one that we got in exchange.”

“How long ago was that?” asked Thorndyke.

“About two months ago I noticed it.”