Better than expected, and a lot better than the reviewers say it is. I can't understand why they didn't like it. Not Shiamalan's best, but not his worst. Actually, it's just plain different.
It is based on a bedtime story that he would tell to his children. As the story grew, he decided to turn it into a movie.
So yeah, it's a bedtime story, but with scary moments.
A story about a nymph who surfaces to our world. For a purpose...
Dripping with morals, this movie is an excellent way to spend your time.