Jack O'Connell has put out two feverish, fearless performances this year. One, you'll see on Christmas Day in Angelina Jolie's Unbroken. This is the other one. It's a grueling movie about life behind bars, O’Connell is absolutely fierce as a young misfit trying to change but unable to catch a break. Starred Up also costars Ben Mendohlson, who gave an incredibly nerve-jangling performance in David Michôd's excellent crime thriller, Animal Kingdom.