 What is the relationship between Sattell and Pop Young?
Sattell got the shakes when he thought of Pop, and Pop rather probably knew it. When Sattell fled to another continent, Pop followed because he had some distinct memories of his wife—and the way he'd felt about her—and some fugitive mental images of his children. When Sattell frenziedly tried to deny knowledge of the murder in Tangier, Pop had come to remember both his children and some of the happiness of his married life. The sun rose very, very slowly in what by convention was called the east. Sattell clearly remembered the crime Pop Young hadn't yet recalled. But then an event occurred which bore directly upon Pop Young and Sattell and Pop Young's missing years. But Sattell undoubtedly dealt with it fully in his desperate writings back to Earth.
 Sattell is trying to escape Pop, who believes he killed his family
 Sattell uses methods to help Pop recover his memories  Sattell is trying to escape Pop, who believes he killed his family  Sattell was Pop's neighbor back on Earth  Sattell is Pop's son and the only witness who saw Pop murder his wife and other children