Lady Elizabeth wants to travel the world, pursue a career, and marry for love, but her mother forbids it. When war breaks out in 1914, she seizes her chance for independence. She moves to London and becomes an ambulance driver. Assigned to a field hospital, Lilly is reunited with Robert Fraser, her brother 's best friend. She yearns for their friendship to become more. In a world divided by class and filled with uncertainty, can their love survive?