Babylon's Ashes is a science fiction novel by James S. A. Corey, the pen name of Daniel Abraham and Ty Franck, and the sixth book in their The Expanse series.

[3] According to the authors, Ty Franck and Daniel Abraham (writers behind the pen name James S.A. Corey), the Babylon's Ashes story, along with the preceding book in the series, Nemesis Games, serves as the overall "hinge point" in the progression of the full set of The Expanse novels.

Marco Inaros calls a meeting of his inner circle including Michio Pa, Anderson Dawes, and others, and lays out his plan for a future for the solar system in which humanity exists completely independently of Earth.

On Luna, James Holden has a meeting with acting UN secretary Chrisjen Avasarala, who informs him that Earth has identified the Azure Dragon, the Free Navy ship that coordinates the meteor attacks.

With the immediate threat of more rock strikes averted, Avasarala plans to launch a major offensive to take back Ceres from the Free Navy.

However, Marco Inaros strategically evacuates the station after stripping it of its resources, leaving the arriving Earth and Martian fleets responsible for the survival of millions of stranded citizens.

The consolidated fleet devises a plan to take back Medina Station, considered to be the most strategically important military objective, as it controls access to the Ring network.

Holden proposes setting up a transport union of belters, to manage the flow of resources from the colonies back to the solar system to rebuild the infrastructure.

"[2] The last novel focused on the backstories of the main characters of the Rocinante crew, and then their intersections with past critical characters;[4] As Alexander notes, "rather than casting the core four—Holden, Naomi, Amos and Alex—as our central perspectives, as in Nemesis Games, [this] saga explodes outwards to include more narrators than The Expanse has ever had to handle, as if to say: this isn’t just about our jokers anymore", but the whole of the system's humanity, belters and earthers and Martians, however impacted by events.