There are book series, and then there are trilogies. The three stories that make up a trilogy are a series, but they have to be much more than that. If you write your own, are you going to follow the rules of a trilogy?
It Comes in Threes
There are many great book and movie trilogies out there. “Star Wars,” which is both, is a huge fan favorite. I’ll hold up “Back to the Future” as an example of a perfect trilogy any day. But if you really want to know the rules, there’s a movie trilogy you can watch to discover most of them: “Scream.” When it comes to writing your trilogy as a series of three books, the greatest trilogies ever told can help guide you through the specific rules that are now considered to be a requirement.