A PROPHET is a French film about a young Muslim who is sent to a French prison. It's an interesting film in many ways, one in that it is unlike American films, and another in that it starts in medias res, giving the audience only passing references to his backstory or the reason why he is in prison. As such, it is only through his actions in prison that we learn his character. This is probably frustrating for people who are used to having all the information spoon-fed to them very simplly the opening three scenes of the movie. But this actually makes the film much stronger.
It is also a long film; at 2 1/2 hours, it seems as though it could have been better paced. It's confusing as well, although I think a lot of that is cultural, I probably would have understood what was going on better if I knew more about French Muslims. Even with the flaws, I found the film fascinating, and highly recommend it.