The asteroid Eros takes direct collision course towards Earth. The Rocinante chases it. As last defense Earth launches missiles against Eros. Miller went inside Eros and makes a surprising discovery.
The final battle between Earth and Mars threatens the very future of humanity; a new monster is unleashed on Prospero Station; Anna receives the smoking gun she needs.
Humanity's fate is on the line as Holden and his allies race against time to save the ring by countering the plan Ashford's team is implementing. A new chapter opens for humanity.
An old friend taunts Holden with the answers he seeks; Naomi struggles to fit in; a mysterious low-level tech aboard the Thomas Prince enacts a terrifying plan.
Inners and Belters fight side by side with the crew of the Rocinante in a last, massive, desperate battle with Marco and his Free Navy, with the fate of the Solar System, the Ring Gates, and of all humanity hanging in the balance.
Ashford closes in on an enemy while uncovering a dangerous plot. Avasarala faces a crossroads in her personal and political life. The Roci crew works to reestablish life on Ilus in the wake of a deadly catastrophe.