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"Prime Mover" is a cross-genre book category built around a central catalyst — an object, person, idea, event, or force — that sets the plot in motion and reshapes characters, societies, or reality itself. Stories in this category explore the origins, nature, and consequences of that catalyst: protagonists may be the catalyst, hunters of it, its victims, or those trying to control or stop it, while themes orbit responsibility, cause-and-effect, power, and transformation. The tone can range from intimate moral drama to high-stakes epic or hard speculative inquiry, and the narrative often unfolds as a slow revelation of how one essential change ripples outward to reconfigure relationships, institutions, or the laws of the world. Prime Mover books appeal to readers who like puzzles of causality, weighty ethical dilemmas, and speculative premises that ask not just what happens next but why it happened at all.

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