If you're going to see this movie, it might be in your best interest to see it at a discount theater, or on a night when your local cinema has a "1/2 price" night or something like that. Mine has $5.00 Tuesdays with free popcorn to members of the club.
REASONS: The show does a fairly good job of building suspense, and it tries to make you interested in the characters. There were a couple of points that I was seriously questioning what some of the characters were doing. There were also a couple of occasions where you seem to led to believe the main character is talking to a wall at night, but then they show the other side of the wall and it is bright golden daylight!
The motivations of the Bishop at the end come off as very suspect. Some of the things he does are not explained, and in character, he tells us that we have to just "trust him" <WARNING! WARNING!!>. At one point I couldn't decide if he was in league with the Bad Guy or not.
The biggest problem is the pacing. All throughout they are building tension and character. Very nice. Then the really strange stuff starts happening. Awesome! Then suddenly the budget for the movie ran out and they said "OK THAT'S IT!" and the movie was over. I wandered out of the theater looking at my watch wondering if the movie was really 1 hr 40 min. It felt very short.
Also, if you like Djimon Hounsou (Guardians of the Galaxy, How to Train Your Dragon 2, Gladiator), he has a couple of scenes, but he is not a primary character. He has a couple of scenes that are enjoyable, just not enough.