"My dear friend, if I succ.u.mb in the struggle you will find those letters (and all the evidence which I have collected against the wretched creature) in the safe hidden behind the small gla.s.s case: Then revenge me. Au revoir. Perhaps good-bye."

Thus ran the third missive. Hippolyte Fauville from his grave named and accused his guilty wife. From his grave he supplied the solution to the riddle and explained the reason why the crimes had been committed: Marie Fauville and Gaston Sauverand were lovers.

Certainly they knew of the existence of Cosmo Mornington's will, for they had begun by doing away with Cosmo Mornington; and their eagerness to come into the enormous fortune had hastened the catastrophe. But the first idea of the murder rose from an older and deep-rooted pa.s.sion: Marie Fauville and Gaston Sauverand were lovers.

One problem remained to be solved: who was the unknown correspondent to whom Hippolyte Fauville had bequeathed the task of avenging his murder, and who, instead of simply handing over the letters to the police, was exercising his ingenuity to deliver them by means of the most Machiavellian contrivances? Was it to his interest also to remain in the background?

To all these questions Marie Fauville replied in the most unexpected manner, though it was one that fully accorded with her threats. A week later, after a long cross-examination at which she was pressed for the name of her husband's old friend and at which she maintained the most stubborn silence, together with a sort of stupid inertia, she returned to her cell in the evening and opened the veins of her wrist with a piece of gla.s.s which she had managed to hide.

Don Luis heard the news from Mazeroux, who came to tell him of it before eight o'clock the next morning, just as he was getting out of bed. The sergeant had a travelling bag in his hand and was on his way to catch a train.

Don Luis was greatly upset.

"Is she dead?" he exclaimed.

"No. It seems that she has had one more let-off. But what's the good?"

"How do you mean, what's the good?"

"She'll do it again, of course. She's set her mind upon it. And, one day or another--"

"Did she volunteer no confession, this time either, before making the attempt on her life?"

"No. She wrote a few words on a sc.r.a.p of paper, saying that, on thinking it over, she advised us to ask a certain M. Langernault about the mysterious letters. He was the only friend that she had known her husband to possess, or at any rate the only one whom he would have called, 'My dear fellow,' or, 'My dear friend,' This M. Langernault could do no more than prove her innocence and explain the terrible misunderstanding of which she was the victim."

"But," said Don Luis, "if there is any one to prove her innocence, why does she begin by opening her veins?"

"She doesn't care, she says. Her life is done for; and what she wants is rest and death."

"Rest? Rest? There are other ways in which she can find it besides in death. If the discovery of the truth is to spell her safety, perhaps the truth is not impossible to discover."

"What are you saying, Chief? Have you guessed anything? Are you beginning to understand?"

"Yes, very vaguely, but, all the same, the really unnatural accuracy of those letters just seems to me a sign--"

He reflected for a moment and continued:

"Have they reexamined the erased addresses of the three letters?"

"Yes; and they managed to make out the name of Langernault."

"Where does this Langernault live?"

"According to Mme. Fauville, at the village of Damigni, in the Orme."

"Have they deciphered the word Damigni on one of the letters?"

"No, but they have the name of the nearest town."

"What town is that?"

"Alencon."

"And is that where you're going?"

"Yes, the Prefect of Police told me to go straightaway. I shall take the train at the Invalides."

"You mean you will come with me in my motor."

"Eh?"

"We will both of us go, my lad. I want to be doing something; the atmosphere of this house is deadly for me."

"What are you talking about, Chief?"

"Nothing. I know."

Half an hour later they were flying along the Versailles Road. Perenna himself was driving his open car and driving it in such a way that Mazeroux, almost stifling, kept blurting out, at intervals:

"Lord, what a pace! Dash it all, how you're letting her go, Chief! Aren't you afraid of a smash? Remember the other day--"

They reached Alencon in time for lunch. When they had done, they went to the chief post-office. n.o.body knew the name of Langernault there.

Besides, Damigni had its own post-office, though the presumption was that M. Langernault had his letters addressed _poste restante_ at Alencon.

Don Luis and Mazeroux went on to the village of Damigni. Here again the postmaster knew no one of the name of Langernault; and this in spite of the fact that Damigni contained only about a thousand inhabitants.

"Let's go and call on the mayor," said Perenna.

At the mayor's Mazeroux stated who he was and mentioned the object of his visit. The mayor nodded his head.

"Old Langernault? I should think so. A decent fellow: used to run a business in the town."

"And accustomed, I suppose, to fetch his letters at Alencon post-office?"

"That's it, every day, for the sake of the walk."

"And his house?"

"Is at the end of the village. You pa.s.sed it as you came along."

"Can we see it?"

"Well, of course ... only--"

"Perhaps he's not at home?"

"Certainly not! The poor, dear man hasn't even set foot in the house since he left it the last time, four years ago!"