"I'll watch this room to-night." As he stood there, speculating on the possibility of the owner of the trinket returning to the room to search for it, he was interrupted by a low tap at the door.

He walked across and opened it.

Tufnell stood outside, grave and composed.
"Mr.Musard would like to see you in the library," he said.
His tone was even and almost deferential, but the detective's watchful eyes intercepted a fleeting glance cast by the butler over his shoulder in the direction of the still figure on the bed.
"Very well, I will see him," said the detective.
"I will take you to him, if you will come with me." The butler preceded him along the passage with noiseless step, and Caldew followed him, deep in thought.
The butler escorted him to the library, and entered after him.

Musard was in the room alone, standing by the fireplace, smoking a cigar.

He looked up as Caldew entered.
"I have just learnt something which I think you ought to know," he said.
"The information comes from Tufnell.