He there perceived that he was in a narrow passage, with matting underfoot. It was dark, except at the farther end, which was slightly illuminated by a dull glow, evidently the reflection of a light from some point round the corner. Proceeding with cautious movements towards it, he came to a spot where the passage made a sharp turn to the right. He dropped to the floor, and, after listening to make sure that no one was approaching, ventured to peep round. At the end of the passage he saw a half-open door, through which the light was streaming; and now he heard the low hum of voices, and in the distance a faint clatter as of cooking utensils. On his left was a massive door clamped with plates of iron. It was shut. Bob guessed that he had been following a passage that led round the inner wall of the tower, and that the iron door was the principal entrance to the tower from the central courtyard of the fort. On the right hand, opposite this door, he saw a broad corridor or entrance-hall, illuminated by a large oil-lamp. He rose and peeped round the corner; the corridor ended with another door richly hung with silk. He waited for a moment. If either door should be suddenly thrown open he was lost. He almost feared lest someone should hear the beating of his heart, so madly was it thumping. It was touch and go. The risk was great, but he had a great purpose. He stepped into the corridor, and crept along towards the silk-hung door. Lifting the curtain, he found that the door stood slightly ajar. He held his breath as he peeped round, and spied, in the midst of a magnificently-furnished apartment, crowded with the rich spoils of many a raid, the one-eared Manchu Chang-Wo, reclining on a divan, and smoking. He wore a loose jacket of blue silk above his pantaloons, and a skullcap. His features had the same impassivity that always characterized him; from his face one could never have guessed whether he was happy or the reverse. As Bob looked, Chang-Wo raised his hand, and with the knuckles struck a small gong that stood by his side. Bob wondered with no little alarm from what quarter the summons would be answered, and gripped his revolver. From a door on the left of the apartment a burly Manchu entered. To him Chang-Wo addressed a few curt words; whereupon the man kow-towed and disappeared through the doorway. There was a sound of voices, then light footsteps in the passage at the end of the corridor—a continuation of the passage up which Bob himself had come. He flattened himself against the wall just as three figures crossed the end of the corridor in front of the iron door, and went along the passage towards the staircase by which he had descended. They were no doubt carrying out the order Chang-Wo had just given. What if, on their return, they should take the nearest way to their chief’s room and come down the corridor instead of along the passage and through the