“Sergeant McBain,” put in the woman quietly.

“You know him?”

Kate shrugged.

“We all know him about here.”

Bill nodded.

“Fyles cursed me for a fool for hollering out. Said he’d been watching that ‘tough,’ and didn’t want to lose sight of him. I got riled. I told him a few things, and said I’d a right to hail my brother any old time. Then he changed around and said he was sorry, and asked me if I was sure it was my brother. When I told him ‘yes,’ he thanked me for putting him wise, and said I’d saved him a deal of unnecessary trouble. Said there was no more need to watch him—seeing he was my brother. That’s when he told me about the storm, and I hit my short cut, and, finally, reached—the river. Now, what was he watching for, and who did he mistake Charlie for? What’s the meaning of the whole thing? Why did O’Brien warn me? These are the things that get me puzzled to death. Maybe you can tell me—can help me out?”

He waited, confidently expecting an explanation that would clear up all the mystery, but none was forthcoming. Instead, when Kate finally replied, there was an almost peevish complaint in her tone.

“I wish you had taken O’Brien’s warning more to heart,” she said. “Maybe you’ve done a lot of harm to-night. I can’t tell—not yet.”

“Harm?” Bill stood aghast.