There are three things that make something a prologue:
- It comes before the first chapter.
- It is a part of the story (as opposed to an introduction, preface, or forward, which are about the story, but not part of it).
- It says "Prologue" at the top.
Simple, right? That's what makes something a prologue instead of, say, "Chapter One," but it doesn't explain what makes a good prologue. That's what this post is about.
WHEN NOT TO PROLOGUE
A lot of writers use prologues as a band-aid for a bad beginning. This doesn't work (I'll explain why in a second). It actually has the opposite effect, to the point where some people skip prologues entirely. TIP #1: Don't use a prologue because you need a better beginning. Fix your beginning.
There are generally two kinds of band-aid prologues. The first is the FALSE ACTION SCENE, in which the writer is told he should start with action, so he inserts a scene that has nothing to do with the inciting incident. Sometimes the writer will use a flash-forward, inserting a tense scene from the climax and letting that be the tension that drives the reader through their boring beginning.
The reason this doesn't work is because starting a story is hard, and when you add a prologue, you require the reader to start your story twice. TIP #2: Don't use a prologue just to suck the reader in. You'll only have to suck them in a second time when the prologue's over.
The second band-aid prologue is the BACKSTORY INFODUMP. This happens when the writer is afraid the reader will become lost without all the background. Sci-fi and fantasy are notorious for this. A good genre writer, though, is able to mix telling details into the story so they don't have to put it all up front in one big exposition. TIP #3: Don't use a prologue to explain the world or backstory or any other kind of telling exposition.
Once again, George Lucas shows us what not to do.
WHEN TO PROLOGUE
Despite their downsides, I like prologues. Used wisely, they can be very effective. Here are some situations in which a prologue can be useful.
- To show a point of view that doesn't appear anywhere else, or doesn't appear until the end. For example, if you need to dramatize some event the protagonist never witnesses, like, say, the mysterious circumstances of their birth.
- To create tension that the protagonist is not immediately aware of. This can be especially effective in mysteries and thrillers, where the real tension (e.g. When will the killer strike next? Will the protagonist learn the truth before the killer comes for him?) is behind the scenes. Then the opening scene, in which the protagonist is going through their daily life, is flavored by the tension that the reader knows something is wrong.
- To manage the reader's expectations about your story. Have you ever read a story that was all dragons and swords and magic, only to discover the evil villain is a space alien with his own spaceship? Genre blending like this can be done well, but if it's done poorly you end up sucker-punching the reader. A prologue establishing that your fantasy world is a forgotten Earth colony, or that "God" in your story is an intelligent super-computer orbiting the planet, can sometimes go a long way towards easing the reader into the weirdness.
Take out the prologue and see if your book still makes sense. If it does, you didn't need it.