"It's probable that the burglars came in and went away by this ladder." "Thank you," said Guerchard.
"They have even left this card-table on the window-sill," said the policeman; and he patted the card-table with his other powerful hand.
"Thank you, thank you," said Guerchard.
"They don't think it's Lupin's work at all," said the policeman.

"They think that Lupin's letter announcing the burglary and these signatures on the walls are only a ruse." "Is that so ?" said Guerchard.
"Is there any way I can help you, sir ?" said policeman.
"Yes," said Guerchard.

"Take up your post outside that door and admit no one but M.Formery, the inspector, Bonavent, or Dieusy, without consulting me." And he pointed to the drawing-room door.
"Shan't I admit the Duke of Charmerace?
He's taking a great interest in this affair," said the policeman.
"The Duke of Charmerace?
Oh, yes--admit the Duke of Charmerace," said Guerchard.
The policeman went to his post of responsibility, a proud man.
Hardly had the door closed behind him when Guerchard was all activity--activity and eyes.

He examined the ladder, the gaps on the wall from which the pictures had been taken, the signatures of Arsene Lupin.

The very next thing he did was to pick up the book which the Duke had set on the top of the footprint again, to preserve it; and he measured, pacing it, the distance between the footprint and the window.
The result of this measuring did not appear to cause him any satisfaction, for he frowned, measured the distance again, and then stared out of the window with a perplexed air, thinking hard.