In 2037, twelve pioneers leave Earth to live, breed, and farm in the newly completed Mars biodome, but something sinister happens while they are on the way. A psychopathic crew member has given the crew and the Company an ultimatum: Acknowledge him as regent of Mars or he will destroy the biodome. Tommie Candour escapes from a storage pod and finds the crew in chaos and communications severed. She is driven by a sense of duty and her love for Turbo to risk her life, and the life of another, in an attempt to save them all.