Set in a dugout in Aisne in 1918, it is the story of a group of British officers, led by the mentally disintegrating young officer Stanhope, as they await their fate.

The biracial daughter, Dido Elizabeth Belle (Gugu Mbatha-Raw), of Royal Navy Captain Sir John Lindsay (Matthew Goode) is raised by aristocratic Great-uncle Lord William Murray, 1st Earl of Mansfield (Tom Wilkinson) in 18th century...