At that moment there suddenly came over me a sensation which I had once experienced before, and which I was twice destined to experience again. It is impossible to describe it, but it seized me, laying siege to my brain till I felt like a child in its power. It was as if I were slowly drowning in the great ocean of silence that enveloped us. Time itself seemed to have disappeared. At my feet lay the misshapen thing, and the lantern behind it cast a fantastic shadow of its distorted outline on the cell wall before me. "Speak; say something," I cried to Clinton. The sharp sound of my voice broke the spell. I felt myself again, and smiled at the trick my nerves had played on me. I bent down and once more laid my hands on the coffin, but before I had time to push it back into its place Clinton had gone up the passage like a man who is flying to escape a hurled javelin. Exerting all my force to prevent the door from swinging back by keeping my leg against it, I had just got the coffin into the cell and was going out, when I heard a shrill cry, and Clinton came tearing back down the passage. "I can't get out! The stone has sunk into its place! We are locked in!" he screamed, and, wild with fear, he plunged headlong into the cell, upsetting me in his career before I could check him. I sprang back to the door as it was closing. I was too late. Before I could reach it, it had shut with a loud clang in obedience to the infernal witchcraft. "You have done it now," I cried angrily. "Do you see? Why, man, we are buried alive in this ghastly hole!" The lantern I had placed just inside the door, and by its dim light, as I looked at him, I saw the terror of a madman creep into Clinton's eyes. "Buried alive!" he shouted, with a peal of hysterical laughter. "Yes, and, Bell, it's your doing; you are a devil in human shape!" With a wild paroxysm of fury he flung himself upon me. There was the ferocity of a wild beast in his spring. He upset the lantern and left us in total darkness. The struggle was short. We might be buried alive, but I was not going to die by his hand, and seizing him by the throat I pinned him against the wall. [Illustration: "It had shut with a loud clang." A Master of Mysteries.--Page 86] "Keep quiet," I shouted. "It is your thundering stupidity that has caused all this. Stay where you are until I strike a match." I luckily had some vestas in the little silver box which I always carry on my watch-chain, and striking one I relit the lantern. Clinton's paroxysm was over, and sinking to the floor he lay there shivering and cowering. It was a terrible situation, and I knew that our only hope was for me to keep my presence of mind. With a great effort I forced myself to think calmly over what could be done. To shout for help would have been but a useless waste of breath. Suddenly an idea struck me. "Have you got your father's letter?" I cried eagerly. "I have," he answered; "it is in my pocket."