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Twist should be quick. Ideally, within a scope of a short paragraph reader's world should be turned upside down and the general idea of what was really going on must be formed. At this point, read...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41809 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Twist should be quick. Ideally, within a scope of a short paragraph reader's world should be turned upside down and the general idea of what was _really_ going on must be formed. At this point, reader likely should have some burning questions ("But why?" "But how?"). Those questions also should be addressed without delay. So if your twist needs a lot of pages to get explained, that is not a good twist. Only if the concept itself is very interesting, the reader may appreciate that. What you can do to improve that? Try to spread your "infodump" throughout the preceding chapters so that the reader get generally familiar with surrounding concepts and conflicts while not losing the interest. This may be difficult without spoiling the big twist, but you should try.