"A bad actor, sure," Rex agreed.
"Joe threatened him. The fellow carried a knife. It seems Joe stole away from the canoe that night just as soon as he thought Kirby was asleep; the night the rock fell, you know."
"Go on."
"But Harry wasn't asleep. He timed the fellow, and Joe was gone two hours. When he came back, Harry asked him if he'd been over here to our camp, and the Indian flew into a rage."
"I see."
"Told him if he said a word about it, or even about having been on the island that night, he'd fix him. Nice sort of a bird!"
"Kirby should have told us."
"So I said. But it's done now. There's one thing I haven't told you, Rex."
"What's that?"
"The Indian got back to the canoe long before midnight, and did not leave the spot again, Harry says, till morning. He is sure of this. Four or five hours elapsed, then, before the rock slid down on you fellows. How do you account for that?"