 Why had Betty really come to Ganymede?
The glowing semi-disk of Jupiter was more than half a million miles distant. "You know I took this piloting job just to scrape up money for an advanced engineering degree back on Earth. It had been built for Ganymede, but not for Jeffers. Tolliver began to have his doubts the next day; which was "Tuesday" by the arbitrary calender constructed to match Ganymede's week-long journey around Jupiter. He soon found that there was nothing for him to do but hang around the garage in case a spaceship should land. Sometimes there's no reason but them for sending a ship back with a crew instead of in an economy orbit. Under a portable, double-chambered plastic dome blown up outside the ship's airlock, a crewman helped him load two trunks and a collection of bags into the tractor. Trying already to be just one of the gang, instead of Lady Betty! They found they could send back loaded ships by 'automatic' flight—that is, a long, slow, economical orbit and automatic signalling equipment. Then they're boarded approaching Earth's orbit and landed by pilots who don't have to waste their time making the entire trip." He enlarged upon other dangers to be encountered on the satellite, taking care to impress the newcomer with the daredeviltry of John Tolliver, driver of "missions" across the menacing wastes between dome and port. "I'm retiring in six months if I'm still alive," he said bravely, edging the tractor into the airlock at their destination.
 to stay as long as it takes to discover who was behaving illegally
 to stay as long as it takes to discover who was behaving illegally  to arrest Jeffers for the crimes they knew he committed  to study how the business was run  to see if the real Betty could handle working there