The detective said nothing.

“Well, well,” said Anthony. “Regrets are vain, and all may not yet be lost. I’ve only got to get hold of dear old Stylptitch’s Reminiscences between now and next Wednesday and all will be gas and gaiters.”

“Would you mind coming back to the Council Chamber, Mr. Cade? There’s one little thing I want to point out to you.”

Back in the Council Chamber, the detective strode over at once to the middle window.

“I’ve been thinking, Mr. Cade. This particular window is very stiff, very stiff indeed. You might have been mistaken in thinking that it was fastened. It might just have stuck. I’m sure—yes, I’m almost sure, that you were mistaken.”

Anthony eyed him keenly.

“And supposing I say that I’m quite sure I was not?”

“Don’t you think you could have been?” said Battle, looking at him very steadily.

“Well, to oblige you, superintendent, yes.”

Battle smiled in a satisfied fashion.