"You can be betrayed."
"By whom?"
"Your old mates."
"Gone away. I've sent them out of France."
"Where to?"
"That's my secret. I left you at the police office, in case I should require your services; and you see that I was right."
"But suppose the police discover your real identity?"
"Well?"
"They'll arrest you."
"Impossible!"
"Why?"
"They can't arrest me."
"For what reason?"
"You've said it yourself, fat-head: a first-class, tremendous, indisputable reason."
"What do you mean?"
"I'm dead!"
Mazeroux seemed staggered. The argument struck him fully. He at once perceived it, with all its common sense and all its absurdity. And suddenly he burst into a roar of laughter which bent him in two and convulsed his doleful features in the oddest fashion:
"Oh, Chief, just the same as always! … Lord, how funny! … Will I come along? I should think I would! As often as you like! You're dead and buried and put out of sight! … Oh, what a joke, what a joke!"
* * * * *
Hippolyte Fauville, civil engineer, lived on the Boulevard Suchet, near the fortifications, in a fair-sized private house having on its left a small garden in which he had built a large room that served as his study. The garden was thus reduced to a few trees and to a strip of grass along the railings, which were covered with ivy and contained a gate that opened on the Boulevard Suchet.
Don Luis Perenna went with Mazeroux to the commissary's office at Passy, where Mazeroux, on Perenna's instructions, gave his name and asked to have M. Fauville's house watched during the night by two policemen who were to arrest any suspicious person trying to obtain admission. The commissary agreed to the request.
Don Luis and Mazeroux next dined in the neighbourhood. At nine o'clock they reached the front door of the house.
"Alexandre," said Perenna.
"Yes, Chief?"
"You're not afraid?"
"No, Chief. Why should I be?"
"Why? Because, in defending M. Fauville and his son, we are attacking people who have a great interest in doing away with them and because those people seem pretty wide-awake. Your life, my life: a breath, a trifle. You're not afraid?"
"Chief," replied Mazeroux, "I can't say if I shall ever know what it means to be afraid. But there's one case in which I certainly shall never know."
"What case is that, old chap?"
"As long as I'm by your side, Chief."
And firmly he rang the bell.
CHAPTER THREE
A MAN DOOMED
The door was opened by a manservant. Mazeroux sent in his card.
Hippolyte received the two visitors in his study. The table, on which stood a movable telephone, was littered with books, pamphlets, and papers. There were two tall desks, with diagrams and drawings, and some glass cases containing reduced models, in ivory and steel, of apparatus constructed or invented by the engineer.
A large sofa stood against the wall. In one corner was a winding staircase that led to a circular gallery. An electric chandelier hung from the ceiling.
Mazeroux, after stating his quality and introducing his friend Perenna as also sent by the Prefect of Police, at once expounded the object of their visit.
M. Desmalions, he said, was feeling anxious on the score of very serious indications which he had just received and, without waiting for the next day's interview, begged M. Fauville to take all the precautions which his detectives might advise.
Fauville at first displayed a certain ill humour.
"My precautions are taken, gentlemen, and well taken. And, on the other hand, I am afraid that your interference may do harm."
"In what way?"
"By arousing the attention of my enemies and preventing me, for that reason, from collecting proofs which I need in order to confound them."
"Can you explain—?"
"No, I cannot … To-morrow, to-morrow morning—not before."
"And if it's too late?" Don Luis interjected.
"Too late? To-morrow?"
"Inspector Vérot told M. Desmalions's secretary that the two murders would take place to-night. He said it was fatal and irrevocable."
"To-night?" cried Fauville angrily. "I tell you no! Not to-night. I'm sure of that. There are things which I know, aren't there, which you do not?"
"Yes," retorted Don Luis, "but there may also be things which Inspector Vérot knew and which you don't know. He had perhaps learned more of your enemies' secrets than you did. The proof is that he was suspected, that a man carrying an ebony walking-stick was seen watching his movements, that, lastly, he was killed."
Hippolyte Fauville's self-assurance decreased. Perenna took advantage of this to insist; and he insisted to such good purpose that Fauville, though without withdrawing from his reserve, ended by yielding before a will that was stronger than his own.
"Well, but you surely don't intend to spend the night in here?"
"We do indeed."
"Why, it's ridiculous! It's sheer waste of time! After all, looking at things from the worst—And what do you want besides?"
"Who lives in the house?"
"Who? My wife, to begin with. She has the first floor."
"Mme. Fauville is not threatened?"
"No, not at all. It's I who am threatened with death; I and my son Edmond. That is why, for the past week, instead of sleeping in my regular bedroom, I have locked myself up in this room. I have given my work as a pretext; a quantity of writing which keeps me up very late and for which I need my son's assistance."
"Does he sleep here, then?"
"He sleeps above us, in a little room which I have had arranged for him.
The only access to it is by this inner staircase."
"Is he there now?"
"Yes, he's asleep."
"How old is he?"
"Sixteen."
"But the fact that you have changed your room shows that you feared some one would attack you. Whom had you in mind? An enemy living in the house? One of your servants? Or people from the outside? In that case, how could they get in? The whole question lies in that."
"To-morrow, to-morrow," replied Fauville, obstinately. "I will explain everything to-morrow—"
"Why not to-night?" Perenna persisted.
"Because I want proofs, I tell you; because the mere fact of my talking may have terrible consequences—and I am frightened; yes, I'm frightened—"
He was trembling, in fact, and looked so wretched and terrified that Don
Luis insisted no longer.
"Very