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Sketch out your entire timeline before you write your story. Have an idea of what happened before and after. Your book takes place in medias res, in the middle of things. If you decide what your en...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/6158 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6158 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Sketch out your entire timeline before you write your story. Have an idea of what happened before and after. Your book takes place _in medias res,_ in the middle of things. If you decide what your entire history is, then you won't develop conflicts in your flashbacks and you won't step on the future, because you'll already have a linear series of events to refer to.