>>214373437
Laconians (the Martian rebels that escape through a ring gate with a stolen fleet) find an automated ship factory and use it to build hybrid ships. They dominate earth and everyone else with those ships. Ayyys take notice of the alien tech going through ring gates and start taking bites of things that pass throuh (literally).
Laconian emperor merges his DNA with the protomolecule to become immortal, he gets arrogant and tries to send bombs to attack the ayys, so the ayys repeat their attack that killed the ringbuilders, humans survive it but they fuck up the emperor and he goes into a coma, the OPA exploits that and beats them (bobby draper suicide bombs the laconian ship in Sol).
Long story short, the emperor wakes up and tries to merge his consciousness with the ringbuilders and Holden shows up at the last minute and just unplugs the faggot. GG.
Last scene is Amos on earth far into the future, he's living in the rubble (he's immortal now because he was rebuilt by the protomolecule on Laconia after a failed assassination attempt on the emperor got him blasted) and he meets some survivors and he's all cryptic and badass about life lessons an shit.
Good books.