The expedition spaceship Ilse is on its way to Earth with a dangerous cargo. However, suddenly, malfunctions begin to pile up, and the crew finds themselves in great danger. It seems that all the troubles are related to the giant planet Jupiter, whose orbit the ship is currently crossing. The expedition is heading towards a catastrophe, as an unknown force is plotting plans that are meant to influence the future of humanity. "Jupiter" is the fifth part of the Ice Moon series, which began with "Enceladus.".