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Start the thing in medias res, in mid-action. Then flash back. At least, that's what Aristotle advised in his Poetics. Although it is more than 2000 years old, it still has great advice for writers...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/20445 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/