It's really hard to talk about this movie without giving something away. I'll give away as little as possible, but my recommendation would be, stop reading this or any other review and just watch the movie, it's very good.
Since I don't want to give anything away I can't say much about the story. It starts as a movie about a cute, sweet girl in love, and the movie's use of an actress who exudes sweetness and innocence makes what happens as the movie progresses all the more startling. The movie is devoted to its one central trick, and what's notable is not the trick - lots of movies have tricks - but how much time is spent in showing off the filmmaker's cleverness. This could have been annoying or self indulgent but I enjoyed it. Some people won't be surprised - I'm really not as good as guessing twists as a lot of people (which is why I consider the movie Matchstick Men to be so poor in spite of good reviews; that one I guessed straight through to the end early on) - but I was surprised and quite delighted.
Since I don't want to give anything away I can't say much about the story. It starts as a movie about a cute, sweet girl in love, and the movie's use of an actress who exudes sweetness and innocence makes what happens as the movie progresses all the more startling. The movie is devoted to its one central trick, and what's notable is not the trick - lots of movies have tricks - but how much time is spent in showing off the filmmaker's cleverness. This could have been annoying or self indulgent but I enjoyed it. Some people won't be surprised - I'm really not as good as guessing twists as a lot of people (which is why I consider the movie Matchstick Men to be so poor in spite of good reviews; that one I guessed straight through to the end early on) - but I was surprised and quite delighted.