Sheriff Mal Reynolds has a new partner-a law enforcing robot from the Blue Sun corporation. If he wants to keep his job and protect his sector, he'll have to play by Blue Sun's rulebook. But the robots don't care about motives, about mercy, about anything other than enforcing the law-no matter the cost. The Blue Sun Corporation has helped to run the 'Verse from the shadows for years, but they're ready to step into the light...and if Mal aims to stop them, he'll have to put himself between his people, and a corporation that is ready to take over the 'Verse. There is only one thing to do-reunite the crew of the Serenity for one last impossible job.