The Rocinante answers an unexpected distress signal. Bobbie and Avasarala find themselves being hunted by a mysterious captor. UN Secretary-General Sorrento-Gillis brings in a colleague from his past to lend an ear during this crucial time of war.
Earth strategizes a costly ploy to gain advantage in the war against Mars; Anna struggles to convince Sorrento-Gillis to do the right thing; Avasarala and Bobbie seek refuge aboard the Rocinante.
The Rocinante tends to wounded Martian soldiers in exchange for supplies; Avasarala struggles with how to disseminate a key piece of evidence despite being in hiding.
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.
All eyes turn to the edge of the solar system as a mysterious new presence emerges; Naomi recommits to her roots; Drummer butts heads with a seasoned new commander aboard the Behemoth; and a young Belter makes a name for himself.
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.
The Rocinante seeks a new game plan as they attempt to avoid capture; Melba's true motives are revealed; Naomi is torn between identity and ideal; Anna seeks a way to stay aboard the Thomas Prince.
Holden sees past, present, and future; a ghost from Melba's past threatens her mission; Bobbie struggles to trust an old friend as she leads a group into uncharted territory.
Drummer and Ashford find themselves trapped with few options for survival; Anna tends to the wounded masses as Melba continues to hunt down her prey; the Rocinante crew struggles to survive as Naomi reunites with her true family.
Wounded survivors arrive at the Behemoth. Holden and Ashford have a conversation. Holden tries to come to grips with what he has seen and tries to find out what is going on with the Station.
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.
