And the truth was terrible. He felt, at the thought of it, the same fears that had maddened Inspector Vérot when, already tortured by the poison, he stammered:
"Oh, I don't like this, I don't like the look of this!… The whole thing has been planned in such an infernal manner!"
Infernal was the word! And Don Luis remained stupefied at the revelation of a crime which looked as if no human brain could have conceived it.
For two hours more he devoted all his mental powers to examining the situation from every point of view. He was not much disturbed about the result, because, being now in possession of the terrible secret, he had nothing more to do but make his escape and go that evening to the meeting on the Boulevard Suchet, where he would show them all how the murder was committed.
But when, wishing to try his chance of escaping, he went up through the underground passage and climbed to the top of the upper ladder—that is to say, to the level of the boudoir—he heard through the trapdoor the voices of men in the room.
"By Jove!" he said to himself, "the thing is not so simple as I thought! In order to escape the minions of the law I must first leave my prison; and here is at least one of the exits blocked. Let's look at the other."
He went down to Florence's apartments and worked the mechanism, which consisted of a counterweight. The panel of the cupboard moved in the groove.
Driven by horror and hoping to find some provisions which enable him to withstand a siege without being reduced to famine, he was about to pass through the alcove, behind the curtains, when he was stopped short by a sound of footsteps. Some one had entered the room.
"Well, Mazeroux, have you spent the night here? Nothing new!"
Don Luis recognized the Prefect of Police by his voice; and the question put by the Prefect told him, first, that Mazeroux had been released from the dark closet where he had bound him up, and, secondly, that the sergeant was in the next room. Fortunately, the sliding panel had worked without the least sound; and Don Luis was able to overhear the conversation between the two men.