Nanny McPhee and the Big Bang

Nanny McPhee appears as a calm, unconventional guardian and unsettles the bustling household. The arrival immediately shifts the dynamic, with Isabel, Rory, and the children unsure how this magical tutor will fit into their wartime routine. Her practical magic hints at changes to come, without drawing loud attention.

Cyril and Celia, the wealthy city cousins, are evacuated to the countryside and disrupt the farm's quiet rhythm. Their snobbery clashes with country life, stirring friction but also opportunities for the children to test loyalties. The household begins to adapt to the new presence and its consequences.

Nanny McPhee introduces gentle mischief and firm rules that gradually soften the children's quarrels. The farm's daily routine takes on a new rhythm as chores and compassion slowly replace stubborn pride. The household senses a steadying, almost magical, influence taking hold.

Isabel's brother-in-law Phil's gambling drains assets and puts the family land at risk. He tries a petty scheme, releasing a litter of piglets to force a settlement, and is pursued by two fortune-seeking women. The children recognize the danger and rally to protect what matters most.

Isabel hosts a grateful countryside picnic that briefly celebrates resilience. The moment is shattered when an ARP warning signals war's reach and the possibility of danger beyond the farm. The scene widens the stakes for the Greens and their guests.

A telegram arrives that Rory Green has been killed in action, plunging the family into despair. Isabel falters as the news tests her resolve, while Norman clings to a stubborn belief that his father might still be alive. The house cracks under the weight of presumed loss.

Norman and Cyril persuade Nanny McPhee to accompany them to London to the War Office, seeking the truth behind the telegram. Lord Gray's stern exterior yields to a more human moment as he is pressed to confront his own family's neglect and distance. The trip marks a turning point in the adults' perspectives.

Lord Gray's investigation hints that Phil forged or manipulated the telegram, forcing a deeper look into the family crisis. The adults confront lies and begin to reassess which parts of their story are true. The pressure builds toward a confrontation that could clear the air.

Megsie, Celia, and Vincent come up with playful diversions to delay Isabel from signing Phil's papers. Their ruses—like a pretend mouse in the kitchen—reflect a clever family bond and a resolve to shield their mother. The acts of mischief buy time for truth to surface.

A bomber flies over the barley field, though it does not explode. The blast smudges Phil's incriminating papers with ink, creating a small but crucial clue. This stroke of luck helps the Greens hold onto their land and push toward reconciliation.

Returning home, Nanny McPhee, Norman, and Cyril witness Phil's confession, and Isabel decides he must answer for his lies. Mr. Docherty bravely defuses the bomb, and the family breathes again as danger recedes. Megsie, aided by her siblings and Mr Edelweiss the jackdaw, helps guide the situation to a safe close.

Nanny McPhee's quiet magic fades as the family realizes she was not meant to stay forever. The film reveals Agatha, from the earlier story, returned in baby form to remind them of love's continuity. The Greens' home settles into a renewed calm as the moral of the tale settles in.

Isabel and the children rush outside to greet Rory, who returns with a bandaged arm and a heartfelt reunion. The family rifts begin to mend as the war's shadow lifts from their little world. The farm resumes its rhythm, guided by love and shared resilience.

In a lighthearted post-credits moment, Ellie the elephant shares a bed with Vincent, summoned by Nanny McPhee. The Scratch-o-matic invention adds a final touch of magic to keep spirits bright after the trials. The scene reinforces the film's message that love and a touch of enchantment can endure.