Although the movie started out slow, the ending progressed rather well. It was a typical plot with an ending that was refreshing and surprising.
I can't really say much about it because anything I do say will give the whole thing away. The idea of having a number following you around is kind of creepy though. I seem to think that with the number 22, but it is just a coincidence ;-)
I wouldn't rent it again because once the mystery is solved then you already know what happened and unless there is some fantastic sci-fi or magic in the movie then watching it all over again doesn't interest me.