As she spoke, Felix stopped to give audience to one of the grooms, who had apparently been sent with a message to him. He turned so that his face was once more visible to Isabel. Moody pressed her hand significantly as it rested on his arm. “Look well at that man,” he whispered. “It’s time to warn you. Mr. Felix Sweetsir is the worst enemy you have!” Isabel heard him in speechless astonishment. He went on in tones that trembled with suppressed emotion. “You doubt if Sharon knows the thief. You doubt if I know the thief. Isabel! as certainly as the heaven is above us, there stands the wretch who stole the bank-note!” She drew her hand out of his arm with a cry of terror. She looked at him as if she doubted whether he was in his right mind. He took her hand, and waited a moment trying to compose himself. “Listen to me,” he said. “At the first consultation I had with Sharon he gave this advice to Mr. Troy and to me. He said, ‘Suspect the very last person on whom suspicion could possibly fall.’ Those words, taken with the questions he had asked before he pronounced his opinion, struck through me as if he had struck me with a knife. I instantly suspected Lady Lydiard’s nephew. Wait! From that time to this I have said nothing of my suspicion to any living soul. I knew in my own heart that it took its rise in the inveterate dislike that I have always felt for Mr. Sweetsir, and I distrusted it accordingly. But I went back to Sharon, for all that, and put the case into his hands. His investigations informed me that Mr. Sweetsir owed ‘debts of honor’ (as gentlemen call them), incurred through lost bets, to a large number of persons, and among them a bet of five hundred pounds lost to Mr. Hardyman. Further inquiries showed that Mr. Hardyman had taken the lead in declaring that he would post Mr. Sweetsir as a defaulter, and have him turned out of his clubs, and turned out of the betting-ring. Ruin stared him in the face if he failed to pay his debt to Mr. Hardyman on the last day left to him--the day after the note was lost. On that very morning, Lady Lydiard, speaking to me of her nephew’s visit to her, said, ‘If I had given him an opportunity of speaking, Felix would have borrowed money of me; I saw it in his face.’ One moment more, Isabel. I am not only certain that Mr. Sweetsir took the five-hundred pound note out of the open letter, I am firmly persuaded that he is the man who told Lord Rotherfield of the circumstances under which you left Lady Lydiard’s house. Your marriage to Mr. Hardyman might have put you in a position to detect the theft. You, not I, might, in that case, have discovered from your husband that the stolen note was the note with which Mr. Sweetsir paid his debt. He came here, you may depend on it, to make sure that he had succeeded in destroying your prospects. A more depraved villain at heart than that man never swung from a gallows!”