Follow the career of a young officer in the 22nd Century genetically engineered space navy: As the last star fighter in squadron 111, Midshipman Henry Gallant is on his way from Jupiter to Mars. With the United Planets' fleet on the verge of annihilation, he can expect no help as he passes through the asteroid belt and threatening aliens. With so much uncertainty about the aliens' capabilities and intentions, analyzing the captured computer equipment in Gallant's possession could prove crucial. The fate of Earth could rest on the abilities of Midshipman Henry Gallant. Unfortunately, it is his abilities that have been much in doubt during his tour of duty. In an era of genetic engineering, he is the only Natural (non-genetically enhanced) officer left in the fleet. His classmates and superior officers have all expressed their concern that he will not be up to the demands of the space service. Only bright and attractive junior officer Kelsey Mitchel has shown any sympathy for him. Now as his navigator on the last fighter in squadron 111, her life as well as a good many others, depends of Henry Gallant.