How long I stood there, lost in dim speculations, I do not know, but suddenly, glancing across at the other ledge, crumbling and weathered, I shrank back into the entrance behind me. Two figures came out upon the ledge and I gasped to see that they were Richard Brent and Eleanor Bland. Now I remembered why I had come to the cavern and my hand instinctively sought the revolver in my pocket. They did not see me. But I could see them, and hear them plainly, too, since no roaring river now thundered between the ledges.