He recovered consciousness to find his feet shackled and fastened to rings set in the concrete of the cavern wall. His head throbbed horribly. He raised his hands and found a huge bump on his head, from which thickened blood trickled sluggishly down his cheek. The cavern was flooded with light. On the wall before him, a clock told off the seconds with a metallic tick. He bent down and examined his shackles.
"I'm afraid you can't unfasten them, Doctor," said a sardonic voice.
He looked up to see Saranoff.
"I'm sorry I had to hit you so hard," went on the Russian. "Your half hour of unconsciousness has lessened by that much the time which is yours to indulge in an agony of apprehension. Look."
Dr. Bird's gaze followed the Russian's finger. On the floor, twenty feet from where he was shackled, stood a yellow can with the mark of the Bureau of Standards on its side. He recognized it at once as a radite container, a can of the terrible ultra-explosive which he himself had perfected. He shuddered at the thought of the havoc which its detonation would cause.
"Yes, Doctor, that is a can of radite," said the Russian. "Allow me also to call your attention to the interrupter fuse which is attached to it. When Mr. Carnes cuts the wire outside, you know well enough what will happen. Now, let me invite your attention to the clock on the wall before you. Mr. Carnes arrived at the Bush River station of the P. B. and W. at 2:15 A.M. He had a little trouble getting a boat, but he is now on his way here. It is 2:25. I think he will arrive between 3:30 and 4:00. Perhaps five minutes later, he will find the wire.
"You have a little over an hour in which to contemplate your total extinction, an extinction which will remove from my path the one great obstacle to my domination of the world. I hope you will enjoy your remaining moments. In order to help you to enjoy them, and to realize the futility of human endeavor, I have placed the key of your shackles on the floor here in plain sight, but, alas, out of your reach. I would like to stay and watch your struggle, to see the self-control on which you pride yourself vanish, and to watch you whimper and pray for the mercy you would not find; but I am deprived of that pleasure. I must take personal charge of my men to be sure that there is no slip. Good-by, Doctor, we will never meet again, I fear."
"We will meet again, Saranoff," said Dr. Bird in even tones of cold ferocity which made even Saranoff shiver. "We will meet again, and when you whimper and beg for mercy, remember this moment!"