"Sense of Obligation" by Harry Harrison is a science fiction novel serialized in 1961. When Brion Brandd wins his planet's ultimate competition, he's recruited for a desperate mission to the desert world of Dis. The ruling magter have threatened neighboring planets with cobalt bombs, and a genocidal strike looms. As Brandd investigates the magter's suicidal aggression after his mentor's death, he uncovers a dark secret about survival and symbiosis on this harsh planet. Can he prevent catastrophe before time runs out? (This is an automatically generated summary.)