"Every negro in London must have been there."
"I dare say. Most of them are voodoo worshipers at heart and the power the Master wielded was incredible. They died, but what of him? Was he blown to atoms by the stuff which he had secretly stored, or crushed when the stone walls crumbled and the ceilings came thundering down?"
"There is no way to search among those subterranean ruins, I suppose?"
"None whatever. When the walls caved in, the tons of earth upheld by the ceilings also came crashing down, filling the corridors with dirt and broken stone, blocking them forever. And on the surface of the earth, the houses which the vibration shook down were heaped high in utter ruins. What happened in those terrible corridors must remain forever a mystery."
My tale draws to a close. The months that followed passed uneventfully, except for the growing happiness which to me was paradise, but which would bore you were I to relate it. But one day Gordon and I again discussed the mysterious happenings that had had their being under the grim hand of the Master.
"Since that day," said Gordon, "the world has been quiet. Africa has subsided and the East seems to have returned to her ancient sleep. There can be but one answer—living or dead, Kathulos was destroyed that morning when his world crashed about him."
"Gordon," said I, "what is the answer to that greatest of all mysteries?"
My friend shrugged his shoulders.
"I have come to believe that mankind eternally hovers on the brinks of secret oceans of which it knows nothing. Races have lived and vanished before our race rose out of the slime of the primitive, and it is likely still others will live upon the earth after ours has vanished. Scientists have long upheld the theory that the Atlanteans possessed a higher civilization than our own, and on very different lines. Certainly Kathulos himself was proof that our boasted culture and knowledge were nothing beside that of whatever fearful civilization produced him.