A Million Suns by Beth Revis

Aboard a vast generation ship bound for a distant world, a young woman awakened from cryogenic sleep and the ship’s reluctant leader struggle to rebuild trust while investigating a string of murders and sabotage that point to a deeper conspiracy; as they dig into the vessel’s hidden history and contested authority, factions form, difficult moral choices arise, and their fragile relationship is tested as they fight to determine who will shape the future of the human colony.

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