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Simultaneity is a cross-genre category for books that explore events, perspectives, or timelines occurring at once—either literally (parallel universes, time-split narratives, synchronized actions) or formally (interleaved chapters, mirrored scenes, multiple viewpoints unfolding in lockstep). These works foreground connection and coincidence, using structure as much as plot to show how separate lives, moments, or realities reflect, collide, and alter one another; they often experiment with pacing, perspective, and chronology to produce a sense of simultaneity in the reader’s experience. Whether rooted in science fiction, literary fiction, mystery, or magical realism, Simultaneity novels ask readers to hold multiple truths together, revealing emergent patterns and ethical resonances that only become clear when parallel strands are read side by side.

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