Although a good movie.
There was a episode of the X-Files with almost the same concept and execution as this film.
Not to down play it because I like the juxtaposition of Santi and Erika But just to make it clear that the film is not unique just because it's from another country and has subtitles.
"Ow, Ow, Ow, Ow, When's it going be my turn? Ow, Ow, Ow, Ow...."