One unanswered question: What happened to their actual biological mother? It's never explained and i would really like an answer to that. Now, this movie is extremely dark. Even when you want to hate our "villain", you really cant, because she is written in a way that you feel terrible for her, knowing the all the suffering she went throught, you just feel terrible for her man. She tried her best to save her little "sister", but it's just impossible.
The camera work in this is incredible. Very well shot. Acting to me seems pretty strong. We got strong writing, characters you can care for. Maybe we could have a bit more depth given to Carlos, that might of helped? Because he has barely any depth in this movie. Maybe the sister she could use a bit more depth, because all the depth is drilled into Montse, i think the girl could use some depth too. But then again what depth, when she does not remember anything.
That ending was really out of left field i was not expecting that ending. My eyes were burning during this, but it did not break me like Triangle and Grave of the Fireflies did, the two movies i just mentioned rip your soul apart. But anyway, the movie is for the most part pretty good. The intro is a bit dull, but it gets better really fast.