His investigations led to the discovery of some traces of footsteps on the gravel, traces not sufficiently plain to enable him to distinguish the shape of the shoes that had left them, yet distinct enough to confirm his supposition. The scoundrels had been that way.

Suddenly he gave a movement of delight. Against the border of the path, among the leaves of a little clump of rhododendrons, he saw something red, the shape of which at once struck him. He stooped. It was an apple, the fourth apple, the one whose absence from the fruit dish he had noticed.

"Excellent!" he said. "Hippolyte Fauville did not eat it. One of them must have carried it away--a fit of appet.i.te, a sudden hunger--and it must have rolled from his hand without his having time to look for it and pick it up."

He took up the fruit and examined it.

"What!" he exclaimed, with a start. "Can it be possible?"

He stood dumfounded, a prey to real excitement, refusing to admit the inadmissible thing which nevertheless presented itself to his eyes with the direct evidence of actuality. Some one had bitten into the apple; into the apple which was too sour to eat. And the teeth had left their mark!

"Is it possible?" repeated Don Luis. "Is it possible that one of them can have been guilty of such an imprudence! The apple must have fallen without his knowing ... or he must have been unable to find it in the dark."

He could not get over his surprise. He cast about for plausible explanations. But the fact was there before him. Two rows of teeth, cutting through the thin red peel, had left their regular, semicircular bite clearly in the pulp of the fruit. They were clearly marked on the top, while the lower row had melted into a single curved line.

"The teeth of the tiger!" murmured Perenna, who could not remove his eyes from that double imprint. "The teeth of the tiger! The teeth that had already left their mark on Inspector Verot's piece of chocolate! What a coincidence! It can hardly be fortuitous. Must we not take it as certain that the same person bit into this apple and into that cake of chocolate which Inspector Verot brought to the police office as an incontestable piece of evidence?"

He hesitated a second. Should he keep this evidence for himself, for the personal inquiry which he meant to conduct? Or should he surrender it to the investigations of the police? But the touch of the object filled him with such repugnance, with such a sense of physical discomfort, that he flung away the apple and sent it rolling under the leaves of the shrubs.

And he repeated to himself:

"The teeth of the tiger! The teeth of the wild beast!"

He locked the garden door behind him, bolted it, put back the keys on the table and said to Mazeroux:

"Have you spoken to the Chief of Police?"

"Yes."

"Is he coming?"

"Yes."

"Didn't he order you to telephone for the commissary of police?"

"No."

"That means that he wants to see everything by himself. So much the better. But the detective office? The public prosecutor?"

"He's told them."

"What's the matter with you, Alexandre? I have to drag your answers out of you. Well, what is it? You're looking at me very queerly. What's up?"

"Nothing."

"That's all right. I expect this business has turned your head. And no wonder.... The Prefect won't enjoy himself, either, ... especially as he put his faith in me a bit light-heartedly and will be called upon to give an explanation of my presence here. By the way, it's much better that you should take upon yourself the responsibility for all that we have done.

Don't you agree? Besides, it'll do you all the good in the world.

"Put yourself forward, flatly; suppress me as much as you can; and, above all--I don't suppose that you will have any objection to this little detail--don't be such a fool as to say that you went to sleep for a single second, last night, in the pa.s.sage. First of all, you'd only be blamed for it. And then ... well, that's understood, eh? So we have only to say good-bye.

"If the Prefect wants me, as I expect he will, telephone to my address, Place du Palais-Bourbon. I shall be there. Good-bye. It is not necessary for me to a.s.sist at the inquiry; my presence would be out of place.

Good-bye, old chap."

He turned toward the door of the pa.s.sage.

"Half a moment!" cried Mazeroux.

"Half a moment?... What do you mean?"

The detective sergeant had flung himself between him and the door and was blocking his way.

"Yes, half a moment ... I am not of your opinion. It's far better that you should wait until the Prefect comes."

"But I don't care a hang about your opinion!"

"May be; but you shan't pa.s.s."

"What! Why, Alexandre, you must be ill!"

"Look here, Chief," said Mazeroux feebly. "What can it matter to you?

It's only natural that the Prefect should wish to speak to you."

"Ah, it's the Prefect who wishes, is it?... Well, my lad, you can tell him that I am not at his orders, that I am at n.o.body's orders, and that, if the President of the Republic, if Napoleon I himself were to bar my way ... Besides, rats! Enough said. Get out of the road!"

"You shall not pa.s.s!" declared Mazeroux, in a resolute tone, extending his arms.

"Well, I like that!"

"You shall not pa.s.s."

"Alexandre, just count ten."

"A hundred, if you like, but you shall not...."

"Oh, blow your catchwords! Get out of this."

He seized Mazeroux by both shoulders, made him spin round on his heels and, with a push, sent him floundering over the sofa. Then he opened the door.

"Halt, or I fire!"

It was Mazeroux, who had scrambled to his feet and now stood with his revolver in his hand and a determined expression on his face.

Don Luis stopped in amazement. The threat was absolutely indifferent to him, and the barrel of that revolver aimed at him left him as cold as could be. But by what prodigy did Mazeroux, his former accomplice, his ardent disciple, his devoted servant, by what prodigy did Mazeroux dare to act as he was doing?

Perenna went up to him and pressed gently on the detective's outstretched arm.

"Prefect's orders?" he asked.