Starman's Quest follows sixteen-year-old Alan Donnell, born aboard the starship Lewis & Clark, where relativistic time dilation means Earth ages centuries while the crew barely changes. Haunted by the disappearance of his twin brother Steve, who jumped ship years earlier, Alan becomes obsessed with finding him. During a stopover on a transformed Earth, he encounters the mysterious Synthesis Foundation, which promises humanity the stars—if starship men can break their insular traditions. Torn between loyalty to his family's wandering life and an unknown future, Alan must challenge centuries of custom to reunite with his brother and reshape his destiny.