In this sequel to David Ogilvy's Escape from Jupiter, the colonists are preparing to return to a newly established mining colony on Ganymede, Jupiter's moon. The journey is rendered more dangerous by instability and tensions among the crew members, a malfunctioning computer, a stowaway, and the various dangers of space itself (such as asteroids).
As with Ogilvy's previous work, the focus is strongly on the child protagonists, rather than the adult characters.