It is a tight movie, with Samantha's friend Amanda killed early, leaving Samantha to deal with Lester. Samantha is presented as a very smart 16 y/o, who is trusted by her single mother to stay on the up and up. Her mother is trying to connect her life up again, and leaves for the night. Lester, a cop, is not a good guy, having killed Amanda and is prepared to kill Samantha. Samantha manages to turn the tables on him, and ties him up in the basement and proceeds to visit unpleasantness upon him. One has to suspend some belief as to how she got him down to the basement and secured. And also how she came to inflict some of the damage on him, as that suggests prior knowledge of how. So most of it takes place in the house and basement. The fourth act is sort of confusing, although it does explain some of the background leading up to what happened. And perhaps in the last scene, Samantha gives a really great performance, to contrast with what we first see about her. But also out of character. It could easily have been a better movie. But it does give a lot of 16 y/o girl angst.