Our Friends From Frolix 8 by Philip K. Dick

In a near-future society riven by genetic and social divisions, a disaffected man becomes entangled with a charismatic agitator plotting to upend the entrenched ruling order; their scheme attracts the attention of enigmatic extraterrestrial visitors whose involvement forces characters to confront prejudice, power, and what it means to be human, as political manipulation, identity, and moral ambiguity collide in a tense struggle over the future of the world.

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