Tere are a lot of high school movies with almost the same plot that is twisted and turned into looking differently. The Devil Within is one of those high school movies that has the same plot as always but also has a feel of everyday life to it. Coming from the mind of Matt Dean and directed by Tom Hardy, this move shows a tragic event that occurs on one of the birthday parties in Hollywood. The main character is a cute high school girl called Sirena (Elizabeth Di Prinzio), who is getting ready for her birthday party. Since it's her 18th birthday, everything needs to be perfect. She is planning to use everything she has to make it look amazing. That includes the whole house, lots of friends, swimming pool outdoors and lots of alcohol as well. Together with her boyfriend Johnny (Grey Damon) and her friends, she gets the best party ever. Another important character in this movie is her total opposite, Doug (Ryn Harrison), who is a school outcast. Doug is gothic girl who is having a problem fitting into the regular high school society and she is obsessed with Sirena. But, it turns out that she's not the only one with that obsession. Principal of that school Edwards has the bad habit of stalking her. While the party is going and they are having a good time, something strange starts happening- girls are killed one by one. Happy birthday?