of the curtain, and the third is that the hearth brush was placed in an unusual position—according to Bisset."
"And what are Bisset's conclusions?"
"That the man, whoever he was, had brought mud into the room and then swept it up with the hearth brush; these fragments being pieces that he had swept accidentally under the curtain and so overlooked."
"Good for Bisset!" exclaimed Ned. "He has got there this time, I do believe."
Simon smiled sceptically.
"Sir Reginald was in the library in his walking boots that afternoon. Naturally he would leave mud, and quite likely he swept it up himself then, though the only evidence of sweeping is Bisset's statement about the brush. And what proof is that of anything? Does your hearth brush always stay in the same position?"
"Never noticed," said Ned.
"And I don't believe anybody notices sufficiently closely to make their evidence on such a point worth a rap!" said Simon.
"A servant would."
"Well, Mr. Cromarty, make the most of the hearth brush then."
There seemed for an instant to be a defiant note in the Procurator Fiscal's voice that made Ned glance at him sharply. But he saw nothing in his face but the same set and steady look.
"We're on the same side in this racket, Mr.
