There are two main characters in this movie. Mary and James. James is a serial killer who murdered women in the worst possible ways, and Mary was his girlfriend who witnessed many of the murders. Mary is released on parole, and gets a job on the overnight shift in an out of the way 24 hour gas mart. The mart is a bit of a puzzle, as it seems seedy, but has huge bathroom and locker areas, so it can be a strange set. Mary is on medication, and she thinks she sees James, but is it real or in her imagination? And James is supposed to be in prison. Leading well into the movie is done very well, and keeps up the suspense and when it seems it is James, it turns out to be her imagination. Most of the gore, and there is a lot of it, is in the last act, and in this Mary does things that will leave the viewer dumbstruck. One may wish to cheer for her demise, if only to reduce any future gene pool contribution, and that is sad for how the character was written. The last act really should have been rewritten and it ruins the whole movie. For instance, if the person is truly in danger, then it is best to simply crawl slowly away rather than get up and run?