"Look here, old chap," I said. "I haven't had a moment to thank you. You and Charles arrived in the very nick of time. A few seconds more and I should have been done for; and as for Miss Shepherd ..."

I couldn't go on. I just held out my hand.

He didn't take it—cold-blooded little beggar! He just bowed politely and murmured something that sounded like "Glad to be of any help!" Then he brightened up. "I think, Sir John," he said, "that we can reckon ourselves as quite safe from any intrusion now!" and he waved his hand towards the open door.

"Let 'em all come!" remarked Thumbwood.

Then, quite suddenly, the floor of the cave seemed to heave up and down. The great arc lights which made it as bright as day began to wheel round like fireworks, and I fainted for the second time.

When I recovered it was to find myself in the late Helzephron's own room. Something cold was on my forehead and something chilly and scented trickled down my face. I opened my eyes, and Constance was kneeling by my side.

"My love, my dear love!" she whispered. "I never thought that I should see you alive again. Oh, thank God, thank God!"

Then her arms were round me, and for a long time we spoke no word. I think I know what the man who was called back from death in Palestine long ago must have felt....

She gave me food and wine, and at last, though I felt physically weak and shaken, my mind worked again, and I stood up. We were alone in the room, and no sound came from outside, so I concluded that all was safe for the present.