A miserable man out of a perfectly happy horse

Young doctor from Oxford sets foot on Stonehearst Asylym, a little madhouse in the wilderness, to discover that the lunatics are running the place. Based on a short story by Edgar Allan Poe, yet beats me how the stellar cast (Kate Beckinsale, David Thewlis, Ben Kingsley, Michael Caine and Jim Sturgess) fucks it up or at least can't save anything. Of course, not to altogether them to blame, adapted to shit to begin with.