As the Battle of Britain looms, the villagers are living under a cloud of fear. Pat strikes up a friendship with a Czech soldier stationed nearby, but her joy at independence from Bob is short-lived. Laura is forced to face the consequences of her affair with Richard Bowers, and Spencer and Claire's relationship takes an unexpected turn. Sarah receives some shocking news about Adam, but her sorrow is overshadowed by tragedy for Frances. Meanwhile, Alison strikes a bargain with the police.

Laura is publicly disgraced when news of the Bowers' divorce hits the papers, with grave consequences for the surgery and her friendship with Tom. Pat is tempted by her feelings for Marek while Bob is in hospital. Steph is delighted when Stan returns home on leave, but the reunion is overshadowed by his fears of invasion. Frances discovers a secret at the reading of the will.

The Czech officers organise a dance to keep morale up as the Battle of Britain intensifies. Joyce has some advice for Sarah which is not well-received, while Pat realises that somebody knows about her relationship with Marek. Allison's secret work for the police leaves her forced to decide where her loyalties lie. Steph fears that Stan is becoming a bad influence on his son, and Frances finds out that Peter's affair was more complicated than she thought.

Pat and Marek are reconciled, but when someone sees them together, their relationship is in more danger than ever. The Brindsleys come to realise the full extent of David's injuries becomes apparent, and Teresa faces letting go of the past when she is asked out. Alison fears the consequences of her involvement with the Lyons, Laura is spurred into action by some happy news, and Joyce and Erica work together on a first aid meeting.

Steph fins it hard to deal with the work required during harvest time. Sarah ends up in a dangerous situation, whilst Teresa has a huge decision to make. A newcomer to the village causes friction between Sarah and Frances.

Everybody gets ready for Nick and Teresa's wedding. Marek's impending departure sees Pat with a big decision to make, but Bob has one last trick up his sleeve to thwart her plans.