This is a good try, given the usual low quality of Spanish productions. But, it is still a really bad movie. A thriller with elements of classic noir, the story is plagued by the bad acting of main cast, and a dense and false drama, presumptuous and full of clichés. The worst is the complete lack of consistency, absurdities and unbelievable situations and behaviors of the main parts, which constantly break the suspension of disbelief. As usual in Spanish movies, the depiction of police work is ludicrous and unrealistic.
The best part, the Chinese guys in the very first minutes. The other actors are, simply, not good, plain and without life, lacking chemistry among them, character development, or ability to create empathy with the viewer. Maybe the problem is that they tried to present people, situations and dialogues that are culturally so far from Spanish culture. Perhaps, on the script in paper, it works; but, when filmed, just doesn't work. I guess that a Hollywood remake, solving the holes and inconsistencies, would work as a routinary, but nice thriller.
Overall, a bad, boring, slow, and stupid movie. To avoid.