Overcoming intense hardship on the Greek island of Lemnos, Olive and Grace care for the injured troops from the botched August Offensive while Elsie fights to nurse her wounded husband Syd.

In Egypt, Alice and Elsie are confronted by the heart-wrenching reality of love during wartime, and whilst enduring the horrific conditions on Lemnos, Olive faces her greatest test of faith and resolve.

Alice struggles to accept Harry's death; Hilda discovers an aptitude for anaesthetics; Olive gets a proposal and Elsie returns to the war as part of the Croix Rouge.