The Rocinante crew deals with the fallout over Naomi's betrayal while caught in the middle of the war between Earth and Mars; Avasarala and Bobbie hatch an escape plan. 

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 plans out a costly ploy to gain an 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 search for Prax's daughter comes to a head; Admiral Souther's men plan for mutiny aboard the Thomas Prince. 

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; a young Belter makes a name for himself. 

An old friend teases Holden with the answers he is after, Naomi struggles to adapt, and a mysterious low-level tech on the Thomas Prince begins a horrifying plan. 

The Rocinante attempts to devise a new game plan as they evade capture. Meanwhile, Melba's true intentions come to light, Naomi feels trapped between identity and ideal, and Anna tries to stay on the Thomas Prince. 

Holden sees past, present and future, a ghost from Melba's past threatens her mission and Bobbie finds it difficult to trust an old friend, as she leads a group into unknown 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. 

As survivors arrive at the Behemoth, they divide into two factions over how to handle a life-or-death threat. Meanwhile, Holden struggles with what he has witnessed and the choices he will have to make. 

Holden and his allies try to stop Ashford and his team from destroying the Ring, and perhaps all of humanity.