It was a hard life, and no life for a lone wolf. There were no homestead farms to be settled by lonely pioneer families. Callisto was a sterile place, and to keep life going there at all men had to work together. Cooperation was a lesson Earth civilization had learned only after thousands of years of oppression and war; a lesson that had to be learned before men could cross space; and a lesson that was very difficult to forget on Callisto. At least for most people. Rita and Cliff Belden had control of the trade between Callisto and the inner planets. It didn't start as control, though; the way it began was this: Once the colony had been well established, its operation was left completely up to the Callistans, who shipped as much of their goods to Earth as they could manage, and requisitioned as much food and supplies from Earth as they needed--which was really the best way. The inner planets could not very well take part in the planning of Callisto's activities, since there was no radio contact and the trip took over two months by freighter even when the relative positions of the planets in their orbits was most favorable. One freighter shuttled back and forth between No. 2 Dome on Callisto at one end and any of several inner-planet ports at the other. Rita and Cliff Belden were the two Callistans whose job it was to run that freighter. The little colony was absolutely dependent on the supplies they brought. This fact was obvious to everybody, but the Beldens made a deduction from it which was unprecedented on Callisto: they could threaten to withhold the supplies and thereby force the rest of the colonists to agree to whatever they asked--provided they could make the threat stick. They made the attempt. On one of their trips back from Earth, they put the ship into an orbit around Callisto instead of landing, and announced they would not land until their henchmen on Callisto were in control. And the henchmen did a thorough job of taking control. All the details were taken care of: They quickly seized the radio transmitters that maintained contact with Ganymede, they confiscated all the reserves of spaceship fuel they could find, they clamped down as tightly as they could on communication between the domes; then they started keeping a close check on every tool that could be used as a weapon. There was just one place they slipped up. Their search for fuel wasn't good enough. The people of No. 4 Dome pooled the fuel they had hidden from the Beldens; they seized from the Beldens' guards the Dome's tiny spaceship, which had been assembled on Callisto and which had never been intended to leave the Jupiter system; and they sent the ship off for Venus, with Garcia and Birkerod aboard. Venus was the only possible destination, with the planets' positions in their orbits as they were then: to reach Earth or Mars would have taken either more fuel than they had, or much more time than they could spare. As it was, the trip took eight months.