Twist endings has been a device used by many fiction authors for years now. Done well, it can create a very satisfying emotional ending for the reader. Done poorly, everything that led up to it will end up being a waste.
Here are some things to watch out for:
- Importance. The twist ending should feel important within the context of the story. As in, it should explain the events that preceded it and the questions the readers formed as a result of them. If the readers invested emotion into the story, the ending should tie everything neatly, rather than merely explain away one or two main facts.
- Logic. The twist ending should be logical. This is where it gets dicey, as many writers end up patching holes when they realize their ending isn’t exactly 100% air-tight.
- Effect. All key characters and events should be related to the ending. Otherwise, they will feel immaterial to the story — a waste of time.
- Set up. Make sure you set-up the twist ending properly, such that everything suddenly fits once the revelation has been made. It’s very easy to trip on this end, so make sure you review all events that you have preceding the finish.