The novel “Caliban’s War” by James S.A. Corey was published for the first time in 2012. It’s the second book in the Expanse series and follows “Leviathan Wakes”.
On Ganymede there’s a tense truce between the United Nations and Mars but a battle breaks out when a monstrous creature kills Marines of both armies in service on Jupiter’s moon. Martian Marine gunnery sergeant Roberta “Bobbie” Draper is the only survivor and must testify about what happened but ends up embroiled in political games which lead her to work for the United Nations Assistant Undersecretary of Executive Administration Chrisjen Avasarala.
Jim Holden and the crew of the former Martian fleet spaceship Rocinante are patrolling a space area on behalf of the Outer Planets Alliance (OPA). When they are alerted that something’s going on Ganymede they go to investigate and find that the situation is plummeting. They meet the botanist Praxidike “Prax” Meng, whose daughter has been kidnapped in strange circumstances and with him they discover that someone conducted experiments with the alien protomolecule.