In the second novel of The Expanse series, the action shifts from the Asteroid Belt to a colony on Ganymede, one of Jupiter’s moons. Ganymede is a planet of domes growing food that is transported to all sectors of the solar system. Botanical experiments and growing techniques have made it a rich source of sustenance for the increasingly crowded expanse of planets and space. It has been untouched by the politics and rivalries growing every day throughout the system.
Since the revelations of scientific mass murder on Eros by Julie Mao’s father and his Protogen company in Leviathan Wakes, the solar system now has three seats of political power. The Outer Planets Alliance led by Fred Johnson has gained some measure of legitimacy and Holden and crew have been working for him. Mars, continuing to work on terraforming their planet, spreads its naval fleet defensively into the Belt and out towards Jupiter and Saturn. Earth uses its United Nations forces to try to keep control everywhere. Directed by the amazing and plain spoken Chrisjen Avasarala, Earth’s still vast resources often seem to give them the upper hand.
On pastoral Ganymede, children with certain genetic defects are suddenly disappearing. Rapidly following this is an attack on UN and Martian ground forces by a deadly being that is able to jam their communications and swiftly kill the marines of both factions. Panic and paranoia reign. Everyone is convinced that the “protomolecule” now transforming the planet Venus has sent monstrosities to attack the rich food source that is Ganymede. Fear that the population of Ganymede will meet the same fate as the unfortunate souls on Eros triggers an emergency evacuation of the planet.
Into this charged atmosphere go the crew of the Rocinante, ostensibly to help a scientist find his kidnapped child (which will be a huge publicity boost for the warring factions showing how humanely they can work together), more to the point, having had close proximity to the effects of the protomolecule, they can determine if it has been planted on Ganymede and how quickly it’s moving among the desperately escaping population.
The shifting viewpoints in Caliban’s War give us a closer look at Earth and how it functions in the Expanse, and the narrative of Praxidike Meng, father of the kidnapped child Mei, shows what everyday life could be like in a crowded and ever expanding space society. Holden’s crew has become a tight group who bring to any situation their combined wisdom, bravery and knowledge of the worlds that make up the Expanse.