And Albert read: 'No. 6,766, Mrs. Poidevin, 37, Prince's Gate; vinolia. No. 6,767, Dr. Woolrich, 23, Horseferry Road; chloroform! Can't make out the quantity, but it must be a lot, I should think; the price is eighteen and ninepence.' 'Dr. Woolrich, 23, Horseferry Road?' Simon repeated mechanically. 'Chloroform?' 'That's it,' said Albert. 'You may bet your boots. Let's look him up in the Medical Directory, if they've got one here. Yes, they're sure to have one.' But there was no Dr. Woolrich in the Medical Directory. Once more the brothers stared at each other. Was or was not Ravengar alive? Were they or were they not on his track? 'Listen, Si,' said Albert. 'I'll drive right down to 23, Horseferry Road, and have a look round. Eh? What do you say?' 'I think I'll come, too,' Simon replied. In six minutes Albert pulled up the hansom at the end of the street, and they walked slowly towards No. 23, but on the opposite side of the road. 'That's it,' said Simon, pointing. 'What are you going to do now? Inquire there?' At the same moment a window opened behind them, in the house immediately facing No. 23; they both heard a hissing sound, evidently designed to attract their attention, and they both turned their heads. From a first-story window Hugo was gesticulating at them. CHAPTER XXVI SECOND TRIUMPH OF SIMON 'Come up at once,' Hugo whispered. 'Door opposite top of stairs.' And he threw down on to the pavement a latchkey. 'What do you think of yourself now, Si?' Albert asked his brother, as they entered the house. 'You've let yourself in for something at last.' They found Hugo in an ordinary bedsitting-room. He was wearing his hat and his overcoat, and staring out of the open window. It was a cold night, but he did not seem to feel the icy draught which blew into the apartment. The whole of his attention appeared to be concentrated on No. 23. He did not at first even turn to look at the brothers when they came in. They explained themselves. 'I will tell you why I am here, and what has occurred to me,' said Hugo, playing, perhaps rather nervously, with the knife and cheese-plate which still lay on the small table by the window. 'Then we can decide what to do. I've hired this room.'