Sarah Phelps’ gripping drama tells the story of World War One’s front line medics – their hopes, fears, triumphs and tragedies. The tented field hospital in which they work is a frontier; between the battlefield and home front, but also between the old rules, hierarchies and a new way of thinking. Oona Chaplin (The Hour, Quantum Of Solace), Hermione Norris (Spooks, Cold Feet), ...One of the untold stories of World War 1. Kitty Trevelyan tries to put the past troubles behind her as she joins two other girls to volunteer at one of the busy war hospitals in northern France.