Geary walks in to the Alliance senate, and presents them with a brief of all his actions since he took command. The senate, relieved that he was not planning to stage a coup, promote him to admiral of the fleet, and charge him with ending the war, once and for all.
Geary takes the full fleet and heads to the Syndic home world to negotiate a ceasefire. They attempt to blow up their gate in a suicide attempt to wipe out Geary’s fleet, but a rebellion within the Syndic high command stops and they surrender instead.
Geary is also informed that the Aliens, dubbed the Enigma race, have issued an ultimatum demanding Syndic citizens leave a system immediately. Geary arrives at the system, and fears that the alien fleet outnumbers him by several times. Realizing the Enigmas are using computer manipulation to trick him, he manoeuvers his fleet in a way to completely destroy the alien ships.
Returning back to Alliance space, Geary relinquishes his admiralty, chases after Desjani, replete with a cringy, dramatic proposal in the spaceport. She accepts, and happily ever after.
Excellent end to a very well written and enjoyable series, except for the rather cringe-worthy proposal-marriage ending. There was also a side story involving his reunion with his great-niece, who is another captain in the expanded fleet. The series started strong, flagged a bit in the middle, and picked up at the end, but a better conclusion would have really helped.