December 1941, North East England. Despite the loss of her father, Sarah is settling into her new role at the munitions factory. Her blossoming romance with pitman Stan is a welcome distraction from the dangerous working conditions. But a shocking revelation puts everything on the line.
Meanwhile Fran is missing her sweetheart Davey, who has been conscripted to Bletchley Park. Beth is longing for someone too - and it's not her husband on the front line. As the factory girls face hardship on the home front, they will discover that the heroes they need are already by their side.