Unbroken (out Jan 15) tells the true story of Louis Zamperini - an American soldier who was imprisoned by the Japanese during World War II. Most war dramas feature epic gun fights or heroic rescues. This is about something quite different – the power of human endurance. Directed by Angelina Jolie and starring British newcomer Jack O'Connell, Unbroken is tough to watch but also hugely inspiring. Grade: A-.