That is one messed up female.

If you can ignore the hair, Molly is good in that vaguely detached way she has. And Callum is creepy in that bad boy way he has. It's not an easy movie to watch though. Very bleak with a constant sense of impending doom and some scenes are extremely disturbing. There's also some bad editing and continuity issues but the soundtrack is good. Worth watching but, like I said, not an easy movie.