It`s a rare breed, the old math-based thriller. Which is how this is described, but it`s more than that. The story boils down to one man trying to finish off some others, and a will-they, won`t-they escape finale? 90% of the story is not particularly original, but it is well-acted and easy to follow without being fluent in Spanish, and as the dialogue is not the key to the film, it`s pretty easy to follow events - especially when the walls are literally closing in on our main characters, and people are driving off cliffs. I might well argue though that it`s a damn good job that following the subtitles isn`t crucial, as they were blurred. In fact, the whole film has a grainy-8mm look about it; in terms of actual picture quality this is Grindhouse. I like the film though, which is about a group of mathematicians meeting under mysterious circumstances, invited by "Fermat", as they discover how they relate to each other. The dynamics and tension between them is a good watch, as the odd red herring throws off both them and the viewer. If you don`t mind grainy subtitles and reasonably sub-standard picture quality, then you might well enjoy this.