This movie is a remake of the 2010 British movie Stalker (http://www.imdb.com/title/tt1411236). The story line is virtually identical to the original. Yet it is not formally acknowledged as a remake. None of the original British writers are credited for this movie, and entirely different group of (presumably American) writers are credited for "writing" this movie. I think it's a terrible shame that Hollywood writers can get away with ripping off British movies. The least they can do is properly credit the original. Given that there are so many remakes in Hollywood, it really shouldn't be a problem to acknowledge that this is a remake of the 2010 British movie. Why didn't they admit it?