Savagely John Cortland kicked at his chair as he paced across the room. There was one slender hope, a tiny thread that might save them at last. Europe was prostrated, Asia in turmoil, and America in chaos. All depended on the theory that the origin of the destructive vibration that had set their ozone molecules into their dance of death had intelligence back of it. The source of the radiation could not be found at this time, but that was not needed. If they could use the incoming radiation field as a carrier and heterodyne on it a super-imposed vibration perhaps the source could be destroyed. Japan had furnished the formula for the opposing field, and United Utilities Power the energy. All the great power stations on the planet had been connected up into a unit, all the tremendous kilowatts of energy had been flowing for hours into those great reservoirs of bound energy, the artificial space field invented by Minski of Stalingrad; and the great glass globes at Schenectady had taken this power and had built up a voltage unthinkable. The earth was going to hurl the thunderbolts of Jove. For hours now he had restlessly awaited the signal to release this energy in answer to the Whispering Death. For hours the stunned planet had awaited the moment of decision. When he would release all this pent up energy that Niagara, Victoria, and countless other water falls and many great steam power plants that had been harnessed for man's use, the carefully pre-calculated voltage would hurl an electron stream at a target, the desired wave length would be omitted by the target, and would automatically heterodyne itself on the invading field. This frightful stream of energy would blast its generators into atoms, but it must suffice. It was earth's dying stroke. A bell tinkled and eagerly John Cortland rushed to answer. A quiet voice said. "We are ready. The potential has reached maximum." The zero hour had arrived. Nervously John Cortland looked around the room, at the familiar articles, and once out the window at the sunlight and then back in. He threw the switch. * * * * *