'The Expanse' follows the case of a missing young woman who brings a hardened detective and a rogue ship’s captain together in a race across the solar system to expose the greatest conspiracy in human history. Thomas Jane will play the lead character of Detective Miller, a native of the asteroid belt between Mars and Jupiter. Detective Miller works for a corporate security force that operates as the law in the asteroid belt. Ragged and in search of something he can't identify, Miller finds a new sense of purpose when he's put in charge of the investigation of a missing heiress. Shohreh Aghdashloo will portray Chrisjen Avasarala, a smart and passionate member of a political family legacy who has risen high in the ranks of Earth's governing body. Steven Strait will play Holden, an officer on the ice-carrying freighter, the Canterbury. Holden is a natural leader who's not sure he wants responsibility, but will soon have no choice when he is drawn into a dangerous plot.