Was it too late to save the seven brave men of science who had made up the crew of Earth's first expedition to Venus? Professor Jarvison, his daughter, Elizabeth, and young Corwin Trumbull, who had been given one year of life by doctors on Earth, had crossed the void, hoping to be in time. But here on Venus were two races, locked in mortal combat. And the lost scientists had landed on the wrong side of the planet!