"Either that or he was fiendishly clever," Mr. Weatherley agreed,
pulling nervously at his little patch of gray sidewhiskers. "I
wonder, now--you've read the case, Chetwode?"

"Every word of it," Arnold admitted.

"Have you formed any idea yourself as to the motive?" Mr. Weatherley
asked nervously.

Arnold shook his head.

"At present there seems nothing to go on, sir," he remarked. "I did
hear it said that some one was trying to blackmail him and Mr.
Rosario wasn't having any."

Mr. Weatherley pushed his scant hair back with his hand. He appeared
to feel the heat of the office.

"You've heard that, too, eh?" he muttered. "It occurred to me from
the first, Chetwode. It certainly did occur to me. You will remember
that I mentioned it."

"What did your brother-in-law think of it, sir?" Arnold asked. "He
and Mr. Rosario seemed to be very great friends. They were talking
together for a long time that night at your house."

Mr. Weatherley jumped to his feet and threw open the window. The air
which entered the office from the murky street was none of the
best, but he seemed to find it welcome. Arnold was shocked to see
his face when he turned around.