On January 27, 1967, astronauts Gus Grissom, Ed White, and Roger Chaffee climbed into a new spacecraft perched atop a large Saturn rocket at Kennedy Space Center in Florida for a routine dress rehearsal of their upcoming launch into orbit, then less than a month away. All three astronauts were experienced pilots and had dreams of one day walking on the moon. But little did they know, nor did anyone else, that once they entered the spacecraft that cold winter day they would never leave it alive. The Apollo program would be perilously close to failure before it ever got off the ground. But...