"Oh! I shouldn't dare do _that_, sir!" she broke in, pocketing the twenty dollars. As she spoke, Jack caught a glance of awed respect which she cast across the corridor. "_The middle door_," he said to himself. "Of course not," he said, aloud. "We'll wait. How'll you know when the client goes?" "I expect Madame will ring for me to open the front door, and let the lady out. That's what she usually does." "Very well, when the lady's gone speak for us." Perhaps the black-silk woman wondered why the nice young gentleman hadn't given her ten dollars to try, and a promise of ten more if she succeeded. But that was his affair. Personally, she didn't expect to succeed. She was not acquainted with Madame's private business, but there was certainly something of the first importance "on" this afternoon. No clients had been admitted since four o'clock except the beautiful blonde young lady who had announced herself the other day as the Duchess of Claremanagh or some name like that. Before she was due two gentlemen had come up and hadn't given their names. But Madame had expected them, and they were still with her when the Duchess arrived. The black-silk woman had seen those gentlemen before, though never together. She had not much curiosity about them, for she was not of a curious disposition. That, Madame said, was one reason why she had engaged her. She had been a stewardess on board ship, but had disliked the sea, especially during the war, when she had been torpedoed once. Madame had crossed with her on three occasions, and the last time had offered her this place. Some things she had seen had surprised and even shocked her a little, but she was well paid, and dry land was a good deal better than that nasty grey wet thing, the sea! She felt that she had done right in putting these two new gentlemen into the dining room. If Madame firmly refused to see them, they might possibly be smuggled away without her knowing they had actually been let into the flat. "That elderly party isn't going to stay on watch," Jack said to Nickson, when they had been shut into the commonplace little room where Madame Veno ate her meals. "There's no uneasy curiosity in that meek make-up." "That's wot I was thinkin' myself, sir," agreed Old Nick. "We're in luck so far," Jack went on. "It's time to begin reconnoitring." He went to the door. "If that decent body is in the hall, I shall ask her what time it is, and say my watch has gone slow--which is more than my heart has!" Nickson grinned. Jack peered out into the white-and-red corridor. Nobody was there. The red glass lamp suspended from the ceiling looked to him like a mass of clotted blood. He took two steps across to the middle door, and listened. Then he returned hastily to Nick. "They're in there! I heard the Duchess's voice. Sounds as if she were angry or frightened, or both. And there are two or more men. You and I have got to open the door, locked or unlocked."