The crew of the Rocinante discovers a derelict vessel holding a secret that may destroy humankind. Avasarala visits Holden's family in Montana. Believing all is lost, Miller finds a new reason to forge ahead. Holden and crew realize they're not alone on the Rocinante and find themselves up against a Martian military blockade. Holden and crew arrive at Tycho Station and are surprised by their host's hidden agenda.

Miller discovers revealing information on a hidden data cube. Along with his conspiracy theories about Julie Mao, Miller's obsession with the missing girl intensifies. Holden and crew make a deal with an unlikely ally on Tycho Station. As he pursues Julie Mao, Miller's partner, Havelock, goes missing. Holden and crew are caught in the middle of a desperate battle, as mysterious warships attack and board the Donnager. Avasarala engages in a nasty game of politics with an old friend. While contending with riots on Ceres, Miller connects Julie to the mysterious derelict ship, the Scopuli. Holden and crew are taken prisoner aboard the Donnager, the flagship of the Martian Congressional Republic Navy, and begin to turn against each another. On Earth, UN Deputy Undersecretary Chrisjen Avasarala interrogates a Belter terrorist. Miller uncovers clues about Julie Mao, as water rationing hits Ceres Station. Holden and crew fight for survival in a badly damaged shuttle.

On Ceres Station, Detective Miller begins an off-the-books investigation of a missing heiress, Julie Mao. In the asteroid belt near Saturn, James Holden and the crew of the ice freighter Canterbury investigate a distress call from a mysterious derelict ship, the Scopuli. Frances Fisher as Elise Holden ('Windmills').Rossif Sutherland as Neville Bosch ('Back to the Butcher').Kenneth Welsh as Franklin DeGraaf ('Remember the Cant').Jonathan Banks as Executive Officer ('Dulcinea').François Chau as Jules-Pierre Mao (2 episodes).Kristen Hager as Ade Nygaard (2 episodes).Kevin Hanchard as Inspector Sematimba (3 episodes).Martin Roach as Admiral Souther (3 episodes).Brian George as Arjun Rao (4 episodes).Lola Glaudini as Captain Shaddid (4 episodes).Jared Harris as Anderson Dawes (5 episodes).Jay Hernandez as Dmitri Havelock (5 episodes.Athena Karkanis as Octavia Muss (7 episodes).Shohreh Aghdashloo as Chrisjen Avasarala.

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