Frances takes in an evacuee from Liverpool, who is not what she expected. Erica is forced to face the consequences of her actions, while Miriam writes letters to soldiers on the front line that cause more harm than good. Laura and Richard's secret affair is jeopardised when someone sees them together, Teresa receives devastating news, and Claire must decide whether or not to stand by Spencer.

As the war in Europe draws closer to home and the nation faces its darkest hour, the members of the WI find they have their own battles to fight. Alison looks for a way out of her desperate situation, and Frances tries to help Pat while she still can. Miriam keeps an important piece of news from Bryn, and Richard and Laura realise it may not be possible to keep their affair a secret any longer.