 Why did “Betty Koslow” really come to Ganymede?
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. They found they could send back loaded ships by 'automatic' flight—that is, a long, slow, economical orbit and automatic signalling equipment.
 To investigate possible criminal behavior.
 To investigate possible criminal behavior.  To learn about business management.  To arrest Jeffers.  To take a vacation and date pilots.