Joan is hauled up on a charge of aiding the enemy and faces a possible lifetime in prison, and her actions send ripples through the hospital.Kitty's wracked with guilt that she knew about Joan but didn't stop her. She's desperate for someone to trust, but will she turn to Thomas or Miles?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 scared of war, Peter has a difficult decision to make. Rosalie, too, is feeling conflicted, unsure how to deal with her discovery of Kitty's divorce.As night falls some rules will be broken, others upheld and as the war machine grinds on faith, hope and love are put to the test.