Internal Consistency: Avoiding Plot Holes
A plot hole isn't a forgotten detail: it's a point where the reader stops believing the story. "But how did they know that?" is the sentence no author wants to hear, and it almost always comes from a consistency problem you could have caught in revision.
Plot hole or deliberate mystery?
Not everything the reader doesn't know is a hole. The difference:
- A deliberate mystery is a question the story raises and, sooner or later, answers (or knowingly chooses not to answer, and the reader accepts it).
- A plot hole is a question the story raises without meaning to and lets drop: a contradiction, a skipped logical step, an explanation missing where it's needed.
The test: if a careful reader asked you about that point, would you have an answer that's in the book? If yes, it's a mystery. If the answer is "I didn't think about it," it's a hole.
The most common causes
- Impossible information. A character knows something they couldn't know: they weren't there, no one told them, there were no traces.
- The coincidence that saves. The protagonist is trapped and the right help arrives by chance. A coincidence that gets a character into trouble is acceptable; one that pulls them out is a hole.
- The unpaid setup. You plant an object, a line, a character with emphasis, and then they never return. The reader has logged them and is waiting.
- Times and distances that don't add up. A trip that takes a day one way and three the other for no reason; a character who ages two years over six months of story.
- Behaviour out of character. Someone acts against everything we know about them only because the plot needs that move.
- The world rule broken. In a fantasy, a power that halfway through does something previously declared impossible.
The checks to run in revision
You don't catch these by rereading "carefully": you catch them with targeted passes, one per type of problem.
- Who knows what, and since when. For every important reveal, check that the character using it had a plausible source, and note which scene they got it in.
- The clue hunt. List every object, name and detail introduced with emphasis. Next to each, write where it's paid off. The empty lines are the problem.
- The timeline. Put the events in order with dates or "days since the start." Check trip durations, character ages, seasons, moon phases if you name them.
- The motive for every turn. For every important character choice, check that it comes from what we know about them, not from what the plot needs.
- The world rules. List what's possible and what isn't. Then find every scene where those limits are touched.
The tool that prevents them
Most of these holes wouldn't open if the fixed facts of the story lived in one place. A sheet per character with "what they know and since when," a timeline with dates, a list of the world rules: keeping them current as you write costs five minutes a session and removes the most frequent contradictions at the source.
Frequently asked questions
Does every plot hole have to be plugged?
No. Some plug with a line of dialogue, others by accepting a small implausibility no reader will notice. The criterion is visibility: a hole in a key scene has to be fixed, one in a background detail can often be left.
How do I see holes when I already know the whole story?
You don't, cold, on your own: that's why you need the targeted passes with a written list, and that's why you need an outside reader. Someone who knows the plot "fills in" the jumps without noticing.
Are beta readers for this?
Yes, it's one of their best uses. Ask explicitly for them to mark every "but how...?" as they read, without stopping to reason it out: the hot reaction is the data you need.
Can a twist contradict what the reader knew?
It can flip the interpretation, not the facts. If rereading the earlier scenes in light of the reveal, everything holds, it's a good twist. If something no longer adds up, it's a hole dressed as a surprise.
How bad is a coincidence?
It depends where it lands. At the start, to kick off the story, it's almost mandatory and the reader forgives it. In the middle or at the end, to solve a problem, it's almost always a hole: the protagonist has to earn the way out.