For a moment I stood horror-struck. I turned and saw the passage behind me blocked by another heavy brute, with a huge grey face and twinkling little eyes, advancing towards me. I looked round and saw to the right of me and a half-dozen yards in front of me a narrow gap in the wall of rock through which a ray of light slanted into the shadows.

“Stop!” cried Moreau as I strode towards this, and then, “Hold him!”