The 'Night Chronicles' Experiment
Released in 2010, Devil was intended to be the first in a trilogy of films called 'The Night Chronicles,' where M. Night Shyamalan would provide the story and produce, while letting up-and-coming directors take the helm. While the trilogy never quite materialized as planned, this first entry remains a fascinating example of how to make a lot out of a little.
Filming almost entirely in an elevator is a technical nightmare, but directors John Erick and Drew Dowdle manage to keep the camera angles fresh enough that you don't get bored. The movie relies heavily on the 'Ten Little Indians' trope—characters being picked off one by one—but adds the supernatural layer that someone in the room isn't actually human.
Why it lands for the PG-13 crowd
For parents, the biggest win here is that the movie is relatively 'clean' for a horror film. Most of the violence happens when the lights go out, meaning you see the aftermath rather than the act itself. This keeps it firmly in the PG-13 camp. It also deals with themes of guilt and the idea that our past actions have consequences, which can actually lead to some decent post-movie chats about accountability.
It's not a masterpiece, and some of the logic towards the end gets a bit stretchy, but if your kid is asking to watch something 'scary' and you aren't ready to let them dive into The Exorcist or Hereditary, this is a very safe middle ground.