“Then that explains all,” said Monte Cristo. “Your grandfather knows, then, that a poisoner lives here; perhaps he even suspects the person. He has been fortifying you, his beloved child, against the fatal effects of the poison, which has failed because your system was already impregnated with it. But even this would have availed little against a more deadly medium of death employed four days ago, which is generally but too fatal.”

“But who, then, is this assassin, this murderer?”

“Let me also ask you a question. Have you never seen anyone enter your room at night?”

“Oh, yes; I have frequently seen shadows pass close to me, approach, and disappear; but I took them for visions raised by my feverish imagination, and indeed when you entered I thought I was under the influence of delirium.”

“Then you do not know who it is that attempts your life?”

“No,” said Valentine; “who could desire my death?”