The movie begins with the Brown family in disarray. The father, Mr. Brown, is a widowed doctor who is trying to balance his work and family life, but his children are running amok. When Nanny McPhee arrives, she uses her unique brand of magic and discipline to transform the children into well-behaved and helpful youngsters. As the story unfolds, Nanny McPhee helps the family overcome their challenges and learn valuable lessons about love, discipline, and the importance of family.