The great detective was most frank and kindly toward his lesser colleague, and made him welcome with a genial courtesy.

“I’m going to make a thorough examination of these lower rooms,” said Fleming Stone, “and I should be glad of the assistance of you two younger men. My eyes are not what they once were.”

Mr. Fairbanks and Rob well knew that this statement was merely an idle compliment to themselves; for the eyes of Fleming Stone had never yet missed a clue, however obscurely hidden.

But Kitty, ignorant of the principles of professional etiquette, really thought that Fleming Stone was depending on his two companions for assistance.

Tom Willard had gone out, and Miss Morton was looking after her all-important housekeeping, so the three men and Kitty French were alone in the library.

In his quick, quiet way Fleming Stone went rapidly round the room. He examined the window fixtures and curtains, the mantel and fireplace, the furniture and carpet, and came to a standstill by the library table. The dagger, which was kept in a drawer of the table, was shown to him, but though he examined it a moment, it seemed to have little interest for him.

“There’s not a clue in this room,” he said almost indignantly. “There probably were several the morning after the murder, but the thorough sweepings and dustings since have obliterated every trace.”

Somewhat abruptly he went into the large hall. Here his proceedings in the library were duplicated. “Nothing at all,” he said; “but what could be expected in a room which is a general thoroughfare?”

Then he went into the drawing-room. The other three followed, feeling rather depressed at the hopeless outlook, and a little disappointed in the great detective.

Stone glanced around the large apartment.