"Well," I continued, "that was the cause of death, as there was neither scratch nor violence on any other part of the body. I picked up that arrowhead in the fireplace of the dining room of the Fen Inn, where it had doubtless been thrown by Felix after the committal of the crime."
"Where did he get the arrowhead?"
"That is just what puzzled me for a long time. Fortunately, I remembered that the entrance to Bellin Hall was decked with a perfect armory of savage weapons. I made an excuse of looking at the picture gallery, and so gained admission to the Hall."
"Did you find anything likely to confirm your suspicions?"
"Yes! I found that an arrow had been removed from the wall."
"How could you tell that?"
"Because the weapons were arranged in patterns, and one of the patterns was incomplete. Moreover, on comparing that arrowhead with those on the wall I found it was precisely similar in appearance."
"Humph," said Merrick thoughtfully, "there is only one deduction to be taken from all this. Felix stole the arrowhead, and, knowing it to be poisoned, rode off to the Fen Inn to kill his brother. He is a clever scoundrel."
"Very clever indeed," I answered dryly; "but for you, Merrick, he would have baffled me altogether."
"I think you have him this time," said Merrick, laughing. "Now, what do you intend to do next?"