In a British base hospital near the front, a team of doctors, nurses and VADs are working together to heal the bodies and souls of the men in their care. This hospital on the coast of France is a frontier between two worlds: between the trenches and the home front, between the old rules, regulations, hierarchies, class distinctions and a new way of thinking. Written by Sarah Phelps (Great Expectations, Oliver Twist) and starring Oona Chaplin (The Hour), Hermione Norris (Spooks), Suranne Jones (Scott and Bailey), Kevin Doyle (Downton Abbey), Kerry Fox (Shallow Grave) and Marianne Oldham (WPC 56) this is the story of World War One's front line medics - their love affairs, professional triumphs, personal tragedies, fears and hopes as they fight for the future.