Naomi tracks down signs of the protomolecule; Fred Johnson's control over the OPA collapses.

Bobbie becomes a political pawn in the struggle between Earth and Mars.

Holden leads his crew through the war-torn station on Ganymede.

Bobbie makes a decision that changes her life forever.

A discovery pushes Naomi and Holden apart and sets the Rocinante crew against each other.

The Rocinante crew must fight to save the ship.

The Rocinante crew deals with the fallout over Naomi's betrayal while caught in the middle of the war between Earth and Mars while 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.

As 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 search for Prax's daughter comes to a head. Admiral Souther's men plan for mutiny aboard the Agatha King

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.

Avasarala, with the Combined Fleet of Earth and Mars, takes the war to Marco. Filip and Marco's relationship is tested. The war becomes more perilous and personal for Holden and Naomi when the Rocinante is suddenly forced into a battle.