Caliban's War: Book 2 of the Expanse (now a major TV series on Netflix) (Expanse)

WE ARE NOT ALONE On Jupiter's largest moon, a Martian marine watches as her platoon is slaughtered by a monstrous supersoldier. On Earth, a high-level politician struggles to prevent interplanetary war from reigniting. And on Venus, an alien protomolecule has overrun the planet, wreaking massive, mysterious changes and threatening to spread out into the solar system. Once again, Jim Holden and the crew of the Rocinante find themselves in the eye of the storm. A missing child may hold the key to humanity's survival - but only if they can find her first.