MacIntyre returns to his home to renew contacts with his elder brother, Sean, and to enlist him in a scheme to discover the mutineers' agent in the space program. It initially succeeds, but when he and Sean attempt to contact the agent, they discover their scan of the space program building was detected. MacIntyre and Sean fend off some of the mutineers (at the cost of Sean's life), but MacIntyre is rescued by an acquaintance, who sends him through a tunnel where he is captured by another group of mutineers.