A prologue is not a place to hide the boring setup. It is a place to create a debt the story must repay.

That is the useful test.

Many prologues fail because they are treated like storage. The writer has history, worldbuilding, prophecy, backstory, family tragedy, political context, or mythology they want the reader to know before Chapter One begins.

But information is not purpose.

A prologue earns its place when it changes how the reader reads the story that follows.

It might show a danger the protagonist does not yet understand.
It might reveal a promise, crime, curse, betrayal, or secret that casts a shadow over Chapter One.
It might give the reader knowledge that creates tension because the main character does not have it yet.

The key is that the prologue should create pressure, not merely explanation.

A weak prologue says, “Here is what happened before.”

A stronger prologue says, “Remember this. It will matter.”

That does not mean the prologue has to be loud. It does not need a battle, murder, prophecy, or shocking twist. A quiet prologue can work if it plants an emotional or dramatic charge the reader carries forward.

A child making a promise over a hospital bed.
A king quietly burning one letter.
Two boys swearing never to tell what happened in the woods.
A mother leaving a key where her son will not find it for ten years.

Each one creates a debt.

The reader continues because they know the story now owes them an answer.

Why did that matter?
Who will discover it?
What will happen when the past reaches the present?

Before adding a prologue, ask:

“What does the reader know after this scene that makes Chapter One more tense?”

If the answer is only “they understand the background,” the prologue may belong later, woven into the story.

But if the answer is “they are now waiting for this hidden pressure to surface,” the prologue has a purpose.

A good prologue does not explain the story before it starts.

It loads the story with consequence.