On desolate Mars, Darrow, the protagonist, is caught in a class system that thrives on oppression and secrecy. He is a Red, the lowest member of society, born to toil in the bowels of the planet in service to the sovereign Golds. When Darrow suffers a devastating loss and betrayal he becomes a revolutionary, out to bring about social justice. Questions of fate, duality, and loyalty, evolve in a cruel test of war between the sons and daughters of the ruling elite.