this be a very dark movie and somewhat good than the average asylum film . it be a lot good than i think it would be and be a combination of a psychological thriller and a horror film . the voice on the telephone be really creepy this voice without a face and this unknown and threatening voice work really well in the film and since we never see the killer face be leave to the imagination of the spectator . the action and suspense never decay and after the first half of the film and it become vertiginous while there be not much gore in this film and just enough to serve the story and also the director do a good job at hold your attention . i give this movie a positive because some clichés .