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Do you mean a Jekyll/Hyde plot? Such a plot twist needs some amount of foreshadowing, so that the savvy reader might suspect, while the less savvy reader would have a moment of "Aha! now it all mak...
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**Do you mean a Jekyll/Hyde plot?** Such a plot twist needs some amount of foreshadowing, so that the savvy reader might suspect, while the less savvy reader would have a moment of "Aha! now it all makes sense!" Such foreshadowing can come in the form of information that Jekyll receives and Hyde responds to, Hyde doing things that would be in one way or another beneficial to Jekyll but Jekyll would never do, Jekyll avoiding conversations about Hyde, etc. (All of this works regardless of whether they're a good/evil duo like Dr. Jekyll & Mr. Hyde, or any other distinction between them.) Another important point would be that they can't be at two places at once. So Jekyll might be unable to make an appointment, for example, with no good explanation, the real reason being that he's busy as Hyde.