it up. It was addressed to Mr. Sabin.

"This is very clever," he mused, hesitating for a moment before
opening it. "I wired for rooms only a few hours ago--and I find
a letter. It is the commencement."

He tore open the envelope, and drew out a single half-sheet of
note-paper. Across it was scrawled a single sentence only.

"Go back to Lenox."

There was no signature, nor any date. The only noticeable thing
about this brief communication was that it was written in yellow
pencil of a peculiar shade. Mr. Sabin's eyes glittered as he read.

"The yellow crayon!" he muttered.

Duson knocked softly at the door. Mr. Sabin thrust the letter and
envelope into his breast coat pocket.



CHAPTER II

"This is the luggage porter, sir," Duson announced. "He is prepared
to answer any questions."

The man took out his book. Mr. Sabin, who was sitting in an
easy-chair, turned sideways towards him.