ten o’clock
I 'll get the better of him in a way that will make a sensation ! ' `` I was then thinking of Larsan , the murderer . It was that same evening that Darzac begged me to watch over Mademoiselle Stangerson . I made no efforts until after we had dined with Larsan , until ten o'clock . He was right there before me , and I could afford to wait . You ought to have suspected , because when we were talking of the murderer 's arrival , I said to you : ` I am quite sure Larsan will be here to-night . ' `` But one important point escaped us both .