Perenna seized a chair by the back, spun it round and sat down upon it, with the simple remark:
"Let's talk!"
And this was said in such a way and the movement executed with so much decision that the Prefect muttered, as though wavering:
"I don't quite see—"
"You soon will, Monsieur le Préfet."
And, speaking in a slow voice, laying stress on every syllable that he uttered, he began:
"Monsieur le Préfet, the position is as clear as daylight. Yesterday evening you gave me an authorization which involves your responsibility most gravely. The result is that what you now want, at all costs and without delay, is a culprit. And that culprit is to be myself. By way of incriminating evidence, you have the fact of my presence here, the fact the door was locked on the inside, the fact that Sergeant Mazeroux was asleep while the crime was committed, and the fact of the discovery of the turquoise in the safe. All this is crushing, I admit. Added to it," he continued, "we have the terrible presumption that I had every interest in the removal of M. Fauville and his son, inasmuch as, if there is no heir of Cosmo Mornington's in existence, I come into a hundred million francs. Exactly. There is therefore nothing for me to do, Monsieur le Préfet, but to go with you to the lockup or else—"
"Or else what?"
"Or else hand over to you the criminal, the real criminal."
The Prefect of Police smiled and took out his watch.
"I'm waiting," he said.
"It will take me just an hour, Monsieur le Préfet, and no more, if you give me every latitude. And the search of the truth, it seems to me, is worth a little patience."
"I'm waiting," repeated M. Desmalions.
"Sergeant Mazeroux, please tell Silvestre, the manservant, that Monsieur le Préfet wishes to see him."
Upon a sign from M. Desmalions, Mazeroux went out.
Don Luis explained his motive.
"Monsieur le Préfet, whereas the discovery of the turquoise constitutes in your eyes an extremely serious proof against me, to me it is a revelation of the highest importance. I will tell you why. That turquoise must have fallen from my ring last evening and rolled on the carpet.
"Now there are only four persons," he continued, "who can have noticed this fall when it happened, picked up the turquoise and, in order to compromise the new adversary that I was, slipped it into the safe. The first of those four persons is one of your detectives, Sergeant Mazeroux, of whom we will not speak. The second is dead: I refer to M. Fauville. We will not speak of him. The third is Silvestre, the manservant. I should like to say a few words to him. I shall not take long."
Silvestre's examination, in fact, was soon over. He was able to prove that, pending the return of Mme. Fauville, for whom he had to open the door, he had not left the kitchen, where he was playing at cards with the lady's maid and another manservant.
"Very well," said Perenna. "One word more. You must have read in this morning's papers of the death of Inspector Vérot and seen his portrait."
"Yes."
"Do you know Inspector Vérot?"
"No."
"Still, it is probable that he came here yesterday, during the day."
"I can't say," replied the servant. "M. Fauville used to receive many visitors through the garden and let them in himself."
"You have no more evidence to give?"
"No."
"Please tell Mme. Fauville that Monsieur le Préfet would be very much obliged if he could have a word with her."
Silvestre left the room.
The examining magistrate and the public prosecutor had drawn nearer in astonishment.
The Prefect exclaimed:
"What, Monsieur! You don't mean to pretend that Mme. Fauville is mixed up—"
"Monsieur le Préfet, Mme. Fauville is the fourth person who may have seen the turquoise drop out of my ring."
"And what then? Have we the right, in the absence of any real proof, to suppose that a woman can kill her husband, that a mother can poison her son?"
"I am supposing nothing, Monsieur le Préfet."
"Then—?"
Don Luis made no reply. M. Desmalions did not conceal his irritation.
However, he said:
"Very well; but I order you most positively to remain silent. What questions am I to put to Mme. Fauville?"
"One only, Monsieur le Préfet: ask Mme. Fauville if she knows any one, apart from her husband, who is descended from the sisters Roussel."
"Why that question?"
"Because, if that descendant exists, it is not I who will inherit the millions, but he; and then it will be he and not I who would be interested in the removal of M. Fauville and his son."
"Of course, of course," muttered M. Desmalions. "But even so, this new trail—"
Mme. Fauville entered as he was speaking. Her face remained charming and pretty in spite of the tears that had reddened her eyelids and impaired the freshness of her cheeks. But her eyes expressed the scare of terror; and the obsession of the tragedy imparted to all her attractive personality, to her gait and to her movements, something feverish and spasmodic that was painful to look upon.
"Pray sit down, Madame," said the Prefect, speaking with the height of deference, "and forgive me for inflicting any additional emotion upon you. But time is precious; and we must do everything to make sure that the two victims whose loss you are mourning shall be avenged without delay."
Tears were still streaming from her beautiful eyes; and, with a sob, she stammered:
"If the police need me, Monsieur le Préfet—"
"Yes, it is a question of obtaining a few particulars. Your husband's mother is dead, is she not?"
"Yes, Monsieur le Préfet."
"Am I correct in saying that she came from Saint-Etienne and that her maiden name was Roussel?"
"Yes."
"Elizabeth Roussel?"
"Yes."
"Had your husband any brothers or sisters?"
"No."
"Therefore there is no descendant of Elizabeth Roussel living?"
"No."
"Very well. But Elizabeth Roussel had two sisters, did she not?"
"Yes."
"Ermeline Roussel, the elder, went abroad and was not heard of again. The other, the younger—"
"The other was called Armande Roussel. She was my mother."
"Eh? What do you say?"
"I said my mother's maiden name was Armande Roussel, and I married my cousin, the son of Elizabeth Roussel."
The statement had the effect of a thunderclap. So, upon the death of Hippolyte Fauville and his son Edmond, the direct descendants of the eldest sister, Cosmo Mornington's inheritance passed to the other branch, that of Armande Roussel; and this branch was represented so far by Mme. Fauville!
The Prefect of Police and the examining magistrate exchanged glances and both instinctively turned toward Don Luis Perenna, who did not move a muscle.
"Have you no brother or sister, Madame?" asked the Prefect.
"No, Monsieur le Préfet, I am the only one."
The only one! In other words, now that her husband and son were dead, Cosmo Mornington's millions reverted absolutely and undeniably to her, to her alone.
Meanwhile, a hideous idea weighed like a nightmare upon the magistrates and they could not rid themselves