There is a reason why crime stories dominate tv and film. People love them! They are equal parts mysterious, suspenseful, horrifying, gruesome, and terrifying. These are the exact traits that draw us in as viewers, and these are the exact same reasons why crime stories are an excellent way to engage secondary students.
In screenwriting (writing for movies and TV), the logline is key to brainstorming story ideas and also selling them or "pitching" them to buyers. Crafting loglines can help the writer to flesh out new plot ideas before writing the entire script. It's much easier to revise the logline rather than an entire hundred page script!
Writing is a process. It is recursive. No piece of writing is ever "final." Something can always be better. I often feel this way whenever I read back over my own old essays and inevitably find a sentence that could be better, a paragraph that could be stronger, or a word that could be more precise.