"Then, sir," said the Captain, "I'll have to show you this. It's ugly,
but it's only justice."

He pulled a sovereign from his pocket and pushed it on the
writing-table under my nose.

"What does this mean?"

"It is a marked one," said he.

"So I perceive." I had picked up the coin and was examining it.

"I found it just now," he continued, "in the room below. The upsetting
of the table had scattered Mackenzie's stakes about the floor."

"You seem to have a pretty notion of evidence," I observed sharply.
"I don't know what accusation this coin may carry; but why need it be
Mackenzie's? He might have won it from Urquhart."

"I thought of that," was the answer. "But no money had changed hands.
I enquired. The quarrel arose over the second deal, and as a matter of
fact Urquhart had laid no money on the table, but made a pencil-note
of a few shillings he lost by the first hand. You may remember, sir,
how the table stood when you entered."

I reflected. "Yes, my recollection bears you out. Do I gather that you
have confronted Mackenzie with this?"

"No. I found it and slipped it quietly into my pocket. I thought we
had trouble enough on hand for the moment."