He had one more turn at sentry duty. But, even while dozing, he remained conscious of all that happened around him. A clock struck the hours with a low chime; and each time Perenna counted the strokes. Then came the life outside awakening, the rattle of the milk-carts, the whistle of the early suburban trains.

People began to stir inside the house. The daylight trickled in through the crannies of the shutters, and the room gradually became filled with light.

"Let's go away," said Sergeant Mazeroux. "It would be better for him not to find us here."

"Hold your tongue!" said Don Luis, with an imperious gesture.

"Why?"

"You'll wake him up."

"But you can see I'm not waking him," said Mazeroux, without lowering his tone.

"That's true, that's true," whispered Don Luis, astonished that the sound of that voice had not disturbed the sleeper.

And he felt himself overcome with the same anguish that had seized upon him in the middle of the night, a more clearly defined anguish, although he would not, although he dared not, try to realize the reason of it.

"What's the matter with you, Chief? You're looking like nothing on earth.

What is it?"

"Nothing--nothing. I'm frightened--"

Mazeroux shuddered.

"Frightened of what? You say that just as he did last night."

"Yes ... yes ... and for the same reason."

"But--?"

"Don't you understand? Don't you understand that I'm wondering--?"

"No; what?"

"If he's not dead!"

"But you're mad, Chief!"

"No.... I don't know.... Only, only ... I have an impression of death--"

Lantern in hand, he stood as one paralyzed, opposite the bed; and he who was afraid of nothing in the world had not the courage to throw the light on Hippolyte Fauville's face. A terrifying silence rose and filled the room.

"Oh, Chief, he's not moving!"

"I know ... I know ... and I now see that he has not moved once during the night. And that's what frightens me."

He had to make a real effort in order to step forward. He was now almost touching the bed.

The engineer did not appear to breathe.

This time, Perenna resolutely took hold of his hand.

It was icy cold.

Don Luis at once recovered all his self-possession.

"The window! Open the window!" he cried.

And, when the light flooded the room, he saw the face of Hippolyte Fauville all swollen, stained with brown patches.

"Oh," he said, under his breath, "he's dead!"

"Dash it all! Dash it all!" spluttered the detective sergeant.

For two or three minutes they stood petrified, stupefied, staggered at the sight of this most astonishing and mysterious phenomenon. Then a sudden idea made Perenna start. He flew up the winding staircase, rushed along the gallery, and darted into the attic.

Edmond, Hippolyte Fauville's son, lay stiff and stark on his bed, with a cadaverous face, dead, too.

"Dash it all! Dash it all!" repeated Mazeroux.

Never, perhaps, in the course of his adventurous career, had Perenna experienced such a knockdown blow. It gave him a feeling of extreme la.s.situde, depriving him of all power of speech or movement. Father and son were dead! They had been killed during that night! A few hours earlier, though the house was watched and every outlet hermetically closed, both had been poisoned by an infernal puncture, even as Inspector Verot was poisoned, even as Cosmo Mornington was poisoned.

"Dash it all!" said Mazeroux once more. "It was not worth troubling about the poor devils and performing such miracles to save them!"

The exclamation conveyed a reproach. Perenna grasped it and admitted:

"You are right, Mazeroux; I was not equal to the job."

"Nor I, Chief."

"You ... you have only been in this business since yesterday evening--"

"Well, so have you, Chief!"

"Yes, I know, since yesterday evening, whereas the others have been working at it for weeks and weeks. But, all the same, these two are dead; and I was there, I, Lupin, was there! The thing has been done under my eyes; and I saw nothing! I saw nothing! How is it possible?"

He uncovered the poor boy's shoulders, showing the mark of a puncture at the top of the arm.

"The same mark--the same mark obviously that we shall find on the father.... The lad does not seem to have suffered, either.... Poor little chap! He did not look very strong.... Never mind, it's a nice face; what a terrible blow for his mother when she learns!"

The detective sergeant wept with anger and pity, while he kept on mumbling:

"Dash it all!... Dash it all!"

"We shall avenge them, eh, Mazeroux?"

"Rather, Chief! Twice over!"

"Once will do, Mazeroux. But it shall be done with a will."