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Rh we knew how they got it out of the house." And he waved his hand towards the window.

"Oh, that!—that's childish," said Guerchard contemptuously. "Those are traces for an examining magistrate. The ladder, the table on the window-sill, they lead nowhere. The only people who came up that ladder were the two men who brought it from the scaffolding. You can see their footsteps. Nobody went down it at all. It was mere waste of time to bother with those traces."

"But the footprint under the book?" said the Duke.

"Oh, that," said Guerchard. "One of the burglars sat on the couch there, rubbed plaster on the sole of his boot, and set his foot down on the carpet. Then he dusted the rest of the plaster off his boot and put the book on the top of the footprint."

"Now, how do you know that?" said the astonished Duke.

"It's as plain as a pike-staff," said Guerchard. "There must have been several burglars to move such pieces of furniture. If the soles of all of them had been covered with plaster, all the sweeping in the world would not have cleared the carpet of the tiny fragments of it. I've been over the carpet between the footprint