"I shall be as quick as I can be, Mr. Billington-Smith," said Harding, evidently feeling that this rambling harangue might go on indefinitely. "I should like first to inspect the study, please, and then perhaps you will let your butler show me the other rooms on this floor."

"What on earth do you want to see the other room for?" asked Geoffrey. "Of course, you can if you like, but I must say I don't quite see -"

"Thank you," said Harding. "I won't keep you am longer now, Mr. Billington-Smith." He turned to Finch, still standing by the door. "Will you take me to the study, please?"

"Yes, show the Inspector the way, will you, Finch?" said Geoffrey, "If you want me just tell Finch, Inspector — not that I can be much use to you, because I didn't happen to be here when my father was murdered, but if you do want me -"

"I'll ask Finch to fetch you if I do," said Harding, and he followed the butler out into the hall.

The constable on duty in the study rose from a chair against the wall when the door was opened, and brightened perceptibly when he saw the Sergeant. It was a dull job, keeping guard on an empty room.

The Sergeant told him he could go and wait outside, and then fixed his gaze on the Inspector, standing still by the desk, looking about him.

"Nothing has been moved, Sergeant, I take it?"

"Nothing but what the Superintendent showed you down at the station," said the Sergeant.

"I see." Harding turned. Just a minute before you go, Finch. When you entered this room with Mr. Guest and Mr. Halliday, were these windows shut, or open?"