“You were quite right about the keys,” said Bill, during a pause. He was less able than the other two, perhaps because he was younger than they, to keep away from the subject which was uppermost in the minds of them all.

“Keys?” said Cayley blankly.

“We were wondering whether they were outside or inside.”

“Oh! oh, yes!” He looked slowly round the hall, at the different doors, and then smiled in a friendly way at Antony. “We both seem to have been right, Mr. Gillingham. So we don’t get much farther.”

“No.” He gave a shrug. “I just wondered, you know. I thought it was worth mentioning.”

“Oh, quite. Not that you would have convinced me, you know. Just as Elsie’s evidence doesn’t convince me.”

“Elsie?” said Bill excitedly. Antony looked inquiringly at him, wondering who Elsie was.