Two days later he received from the Masher, among other information of less importance, a list of the house-party at Montmaur and of all the servants and keepers.

One name struck him, among those of the huntsmen. He at once wired:

"Inquire about huntsman Sebastiani."

The Masher's answer was received the next day:

"Sebastiani, a Corsican, was recommended to the Duc de Montmaur by the Marquis d'Albufex. He lives at two or three miles from the house, in a hunting-lodge built among the ruins of the feudal stronghold which was the cradle of the Montmaur family."

"That's it," said Lupin to Clarisse Mergy, showing her the Masher's letter. "That name, Sebastiani, at once reminded me that d'Albufex is of Corsican descent. There was a connection... "

"Then what do you intend to do?"

"If Daubrecq is imprisoned in those ruins, I intend to enter into communication with him."

"He will distrust you."

"No. Lately, acting on the information of the police, I ended by discovering the two old ladies who carried off your little Jacques at Saint-Germain and who brought him, the same evening, to Neuilly. They are two old maids, cousins of Daubrecq, who makes them a small monthly allowance. I have been to call on those Demoiselles Rousselot; remember the name and the address: 134 bis, Rue du Bac. I inspired them with confidence, promised them to find their cousin and benefactor; and the elder sister, Euphrasie Rousselot, gave me a letter in which she begs Daubrecq to trust M. Nicole entirely. So you see, I have taken every precaution. I shall leave to-night."

"We, you mean," said Clarisse.

"You!"

"Can I go on living like this, in feverish inaction?" And she whispered, "I am no longer counting the days, the thirty-eight or forty days that remain to us: I am counting the hours.

Lupin felt that her resolution was too strong for him to try to combat it. They both started at five o'clock in the morning, by motor-car. The Growler went with them.

So as not to arouse suspicion, Lupin chose a large town as his headquarters. At Amiens, where he installed Clarisse, he was only eighteen miles from Montmaur.

At eight o'clock he met the Masher not far from the old fortress, which was known in the neighbourhood by the name of Mortepierre, and he examined the locality under his guidance.

On the confines of the forest, the little river Ligier, which has dug itself a deep valley at this spot, forms a loop which is overhung by the enormous cliff of Mortepierre.

"Nothing to be done on this side," said Lupin. "The cliff is steep, over two hundred feet high, and the river hugs it all round."

Not far away they found a bridge that led to the foot of a path which wound, through the oaks and pines, up to a little esplanade, where stood a massive, iron-bound gate, studded with nails and flanked on either side by a large tower.

"Is this where Sebastiani the huntsman lives?" asked Lupin.

"Yes," said the Masher, "with his wife, in a lodge standing in the midst of the ruins. I also learnt that he has three tall sons and that all the four were supposed to be away for a holiday on the day when Daubrecq was carried off."