

The inner planets had all been one big, happy, slightly dysfunctional family. Eighteen months before, there hadn’t been sides. Including speculating on the lives of the Marines on the other side. Guard duty around the greenhouses on Ganymede meant doing what you could to keep your mind occupied. “Been on every patrol detail so far today. One of the four UN Marines had black smudges on the sides of his helmet that looked like beagle ears. A greenhouse dome identical in nearly all respects to the dome her own squad was currently guarding. Twenty-five hundred meters away, a squad of four United Nations Marines were tromping around their outpost, backlit by the giant greenhouse dome they were guarding. Gunnery Sergeant Roberta Draper of the Martian Marine Corps upped the magnification on her armor’s heads‑up display and looked in the direction Hillman was pointing. “Snoopy’s out again,” Private Hillman said.

When they agree to help a scientist search war-torn Ganymede for a missing child, the future of humanity rests on whether a single ship can prevent an alien invasion that may have already begun. In the vast wilderness of space, James Holden and the crew of the Rocinante have been keeping the peace for the Outer Planets Alliance.

And on Venus, an alien protomolecule has overrun the planet, wreaking massive, mysterious changes and threatening to spread out into the solar system. On Earth, a high-level politician struggles to prevent interplanetary war from reigniting. On Ganymede, breadbasket of the outer planets, a Martian marine watches as her platoon is slaughtered by a monstrous supersoldier. The second book in the NYT bestselling Expanse series, Caliban's War shows a solar system on the brink of war, and the only hope of peace rests on James Holden and the crew of the Rocinante's shoulders.
