Goodnight Mommy is not a film for everyone. The intensity builds to a certain point, and then never lets up after that. There are some gruesome moments near the end of the film that will have some people checking out early. However, it is a beautifully shot and strangely moving experience, and the two directors have an excellent handle on mood and atmosphere that adds a haunting element to the entire project.
This is a film of many twists and turns - one of which you should spot early on, if you're a seasoned horror buff. The pacing is deliberate, allowing us to get to know these characters well enough so that when the ending finally does arrive, it packs a bigger punch.
Goodnight Mommy is a superior psychological horror film, with three powerful performances that should not be missed. As I said earlier, this is not a film that will appeal to everyone. The chilly tone will not sit well with many - think Michael Haneke's Funny Games meets Robert Mulligan's The Other - but if you stick with it, you'll never forget it. That's for damn sure.