“I suppose we must go on.”

“We can’t prove it yet, you see,” said Ellery. “But we’ve made a really good beginning on the job of bringing last Tuesday’s business home to Woodman, and we mustn’t lose any time in following up that trail to the end.”

“But how do you propose to follow it up? Haven’t you done all you can there?”

“No. Don’t you see? We must prove that the man the servants took for George that night when he went out of this house was really Carter Woodman.”

“That all sounds very well; but I don’t see how you’re going to do it.”

“Neither do I; but I mean to have a shot.”

“My dear Bob, let me try. It’s my turn to do something. I have an idea, and I may be able to find out about it.”

“You’re very mysterious. Won’t you tell me what the idea is?”

“No, Bob. It may come to nothing; and I’d rather try it myself first. It won’t take long to find out. You’ve done all the clever things so far; and I think it’s my turn for a change.”

“Right you are, Joan. I only hope it’s a good ’un.”