Caliban's war

Set in a crowded solar system where tensions between Earth, Mars and the Outer Planets Alliance are rising again, this is the second novel in The Expanse. The story follows three threads. On Ganymede, a Martian Marines soldier survives an attack that wipes out her unit at the hands of a terrifying enhanced fighter. On Earth, a senior politician works to keep the fragile peace from collapsing into another interplanetary war. On Venus, an alien substance called the protomolecule has transformed the planet in strange and unexplained ways and may be preparing to spread across the system.

James Holden and the crew of the Rocinante have been enforcing order for the Outer Planets Alliance, but they are pulled into a different kind of mission. They agree to help a scientist look for a missing child on Ganymede, a moon torn apart by conflict. As the search unfolds, the fate of humanity seems to depend on whether one ship can stop an alien invasion that might already be underway.

The book was written by James S. A. Corey, the shared pen name of Daniel Abraham and Ty Franck, and it was later adapted into a television series for Prime Video.