Summer, 1914. Amy Fletcher's life is transformed when she meets Edmond Derwent, son of one of the wealthiest families in the small town of Larchbury, and student at Cambridge University. When war breaks out, Edmond signs up as an officer and Amy trains as a VAD nurse. Separated by war, Edmond and Amy share their feelings through emotional letters sent from the front line. But when Edmond is critically wounded at Ypres, their love faces the biggest test of all.