In an army hospital the staff heal the bodies and souls of men wounded in the trenches.
Joan is hauled up on a charge of aiding the enemy and faces a possible lifetime in prison. She is desperate to protect Anton so tries to deflect the questions, even as Purbright arrives to drive them home harder. Meanwhile, the hospital is awash with the news of Joan's treachery and Roland is directly in the firing line, accused of letting the rules slide and bringing the RAMC into disrepute. His position rests on a knife edge as old enemies close in. Kitty's wracked with guilt that she knew about Joan but didn't stop her, and she fears for her own position. She is desperate for someone to trust, but will it be Thomas or Miles that she turns to? Elsewhere, Flora discovers Peter's brother, Jimmy, on one of the wards and happily reunites the siblings, but when it becomes clear that Jimmy is too fragile for war Peter has a difficult decision to make. Rosalie too is feeling conflicted, unsure how to deal with her discovery of Kitty's divorce. Her instinct is to condemn, but the world is changing. Could one patient in particular hold the key to her liberation? Joan's actions send ripples through the hospital. As night falls some rules will be broken and others upheld. As the war machine grinds on, faith, hope and love are put to the test.
Grace realises that something is up with Kitty as she keeps her distance. A Major wakes up from the verge of death, still badly wounded he also has to find out that his troops have been decimated. The hospital prepares itself for a convoy of new patients.