Gwent was silent.

With methodical care he flicked off the burnt end of his cigar and watched it where it fell, as though it were something rare and curious.

He wanted a few minutes to think.

He gave a quick upward glance at the tall athletic figure above him, with its magnificent head and flashing eyes,--and the words "I'll be master of the world" gave him an unpleasant thrill.

One man on the planet with power to destroy nations seemed quite a fantastic idea--yet science made it actually possible! He bethought himself of a book he had lately read concerning radio-activity, in which he had been struck by the following passage--"Radio-activity is an explosion of great violence; the energy exerted is millions of times more powerful than the highest explosive substance yet made in our laboratories; one bomb loaded with such energy would be equal to millions of bombs of the same size and energy as used in the trenches.