"Because, for one thing, any sharp pain in the back Nathaniel would think was his lumbago. For another, I'd say kind Uncle Joseph put in a bit of anatomical research, and chose the best place for his purpose."

"But what a risk!" said the Sergeant. "Suppose it hadn't come off? Suppose the old man had dropped down there?"

"He wasn't likely to do that. If he'd turned faint at once, no doubt Joseph would have helped him up to his room, and left him there. Don't forget he thought he'd got rid of the rest of the house-party! He had to take a risk. Keep your eye on him!"

He left the house, and a minute later the Sci-gcitw heard the police-car outside start up and drive away.

It was nearly three hours later when Inspector Hemingway again entered Lexham Manor. He was admitted by Sturry, who said, in a portentous voice, that he was glad to see him,

"Well, that's something new," said Hemingway. "Quite brightens up my day. Ask Mr. Stephen if he can spare me a moment, will you?"

"I will inform Mr. Stephen that you are here, Inspector," said Sturry. "In the meantime, a very Peculiar Thing has occurred, of which I feel you should be instantly apprised."

"You can't apprise me of anything I don't already know, so don't try!" said Hemingway briskly. "Get hold of Mr. Stephen for me!"

Swelling with affronted majesty, Sturry walked away.

In a very few minutes Stephen came into the hall. "Thank the lord you're back!" he said. Joseph's disappeared. We've no idea where he is. Hasn't been seen since he went up to wash his hands before tea."