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Prologs are a never ending source of debate and contention in the writing community with some saying always avoid and other loving them. The truth, as usual, I think lies in-between.
They are far too often used as a place to dump exposition and world building which is usually a sign that an author doesn’t have confidence in their ability to weave that vital information into the narrative itself.
I have often listened to prologs in critique session and advised cutting them and yet my published novel has one so I cannot be described as a rabid anti-prolog writer.
Here are a few quick guidelines I have for effective prologs.
1) It shouldn’t involve the protagonist. If it does, then it should be part of the main narrative.
2) It should contain information that the protagonist doesn’t know at the start of the story. That is, it is information that primes the reader for what is coming but the characters remain blindsided.
3) It should not be resolved. It’s not its own little short story it is a building block of the larger tale. If everything in the prolog is resolved than the reader has no pull to turn the page. The prolog is a harbinger of things to come, not a neat little package complete and finished.