The burglars had found every convenience to their hand-a strong ladder, an egress through the door in the garden wall, and then through the gap formed by the house in process of erection, which had rendered them independent of the narrow passage between the walls of the gardens, which debouched into a side-street on the right.
The Duke turned from the window, glanced at the wall opposite, then, as if something had caught his eye, went quickly to it.
"Look here," he said, and he pointed to the middle of one of the empty spaces in which a picture had hung.
There, written neatly in blue chalk, were the words: ARSENE LUPIN "This is a job for Guerchard," said the inspector.

"But I had better get an examining magistrate to take the matter in hand first." And he ran to the telephone.
The Duke opened the folding doors which led into the second drawing-room.

The shutters of the windows were open, and it was plain that Arsene Lupin had plundered it also of everything that had struck his fancy.

In the gaps between the pictures on the walls was again the signature "Arsene Lupin." The inspector was shouting impatiently into the telephone, bidding a servant wake her master instantly.

He did not leave the telephone till he was sure that she had done so, that her master was actually awake, and had been informed of the crime.