Saw the trailer , thought this might be good and it is. Not just as a thriller but as a horror movie and a stomach turning one at that. Be warned, if medical type grotesqueries bother you, this is kind of sickening. The make-up jobs and special effects are very well done, the movie is genuinely fascinating while being loaded with twists and turns, the score is interesting and most of all Brendan Sexton III is phenomenal in the lead. The cinematography is also excellent and loaded with intriguing shots and like the score add to the movie in ways that elevate it. On the other hand there are some problems. For such an involved story, I wish there had been more to the script, and there were scenes that were very poorly recorded. One scene which was obviously crucial to the story was kind of lost on me as I could barely understand the actors. Talking softly in a film should never be literally talking in a whisper. The plot was great, the script needed work though. Still this is an amazing film, never boring, genuinely different and well-made enough to possibly give me nightmares.