In 1949, Heinlein wrote this story about an entrepreneur who foresaw that future of manned space flight could not be left to governments. His protagonist, D.D. Harriman, risked his reputation, his fortune and his very life to make his dream a reality. The prescience of Heinlein's tale is embodied in a modern-day entrepreneur, who looks beyond the moon to Mars. The future of humans in space cannot be trusted to governments, whose inefficiencies would make it impossible. Though almost seventy years old, this story is more pertinent today than ever.