“I asked him to explain himself, and this is all he would tell me. His anticipation of coming danger had come to him solely from the coincidence that Mademoiselle Stangerson had been twice attacked, and both times when he had been absent. On the night of the incident of the inexplicable gallery he had been obliged to be away from the Glandier. On the night of the tragedy in The Yellow Room he had also not been able to be at the Glandier, though this was the first time he had declared himself on the matter. Now a man so moved who should still go away must be acting under compulsion—must be obeying a will stronger than his own. That was how I reasoned, and I told him so. He replied ‘Perhaps.’—I asked him if Mademoiselle Stangerson was compelling him. He protested that she was not. His determination to go to Paris had been taken without any conference with Mademoiselle Stangerson.
“To cut the story short, he repeated that his belief in the possibility of a fresh attack was founded entirely on the extraordinary coincidence. ‘If anything happens to Mademoiselle Stangerson,’ he said, ‘it would be terrible for both of us. For her, because her life would be in danger; for me because I could neither defend her from the attack nor tell of where I had been. I am perfectly aware of the suspicions cast on me. The examining magistrate and Monsieur Larsan are both on the point of believing in my guilt. Larsan tracked me the last time I went to Paris, and I had all the trouble in the world to get rid of him.’
“ ‘Why do you not tell me the name of the murderer now, if you know it?’ I cried.
“Monsieur Darzac appeared extremely troubled by my question, and replied to me in a hesitating tone:—
“ ‘I?—I know the name of the murderer? Why, how could I know his name?’
“I at once replied: ‘From Mademoiselle Stangerson.’
“He grew so pale that I thought he was about to faint, and I saw that I had hit the right nail on the head. Mademoiselle and he knew the name of the murderer! When he recovered himself, he said to me: ‘I am going to leave you. Since you have been here I have appreciated your exceptional intelligence and your unequalled ingenuity. But I ask this service of you. Perhaps I am wrong to fear an attack during the coming night; but, as I must act with foresight, I count on you to frustrate any attempt that may be made. Take every step needful to protect Mademoiselle Stangerson. Keep a most careful watch of her room. Don’t go to sleep, nor allow yourself one moment of repose. The man we dread is remarkably cunning—with a cunning that has never been equalled. If you keep watch his very cunning may save her; because it ’s impossible that he should not know that you are watching; and knowing it, he may not venture.’
“ ‘Have you spoken of all this to Monsieur Stangerson?’
“ ‘No. I do not wish him to ask me, as you just now did, for the name of the murderer. I tell you all this, Monsieur Rouletabille, because I have great, very great, confidence in you. I know that you do not suspect me.’
“The poor man spoke in jerks. He was evidently suffering. I pitied him, the more because I felt sure that he would rather allow himself to be killed than tell me who the murderer was. As for Mademoiselle Stangerson, I felt that she would rather allow herself to be murdered than denounce the man of The Yellow Room and of the inexplicable gallery. The man must be dominating her, or both, by some inscrutable power. They were dreading nothing so much as the chance of Monsieur Stangerson knowing that his daughter was ‘held’ by her assailant. I made Monsieur Darzac understand that he had explained himself sufficiently, and that he might refrain from telling me any more than he had already told me. I promised him to watch through the night. He insisted that I should establish an absolutely impassable barrier about Mademoiselle Stangerson’s chamber, around the boudoir where the nurses were sleeping, and around the drawing-room where, since the affair of the inexplicable gallery, Monsieur Stangerson had slept. In short, I was to put a cordon round the whole apartment.