“H’m,” said Jimmy. “Then one thing’s quite clear. If, as I suppose, Sir Stanley will be taking the formula with him, any funny business there’s going to be will be tonight.”

“I suppose it will.”

“Not a doubt of it. That narrows the thing down very comfortably. But the bright lads will have to be their very brightest. We must come down to details. First of all, where will the sacred formula be tonight? Will Eberhard have it, or Sir Oswald Coote?”

“Neither. I understand it’s to be handed over to the Air Minister this evening, for him to take to town tomorrow. In that case O’Rourke will have it. Sure to.”

“Well, there’s only one thing for it. If we believe someone’s going to have a shot at pinching that paper, we’ve got to keep watch tonight, Bill, my boy.”

Bundle opened her mouth as though to protest, but shut it again without speaking.