 Cedric Brown (Colin Firth) is a sad and nostalgic widower, owner of an undertaker s business, who doesn t know how to manage the unsustainable situation with his undisciplined children. Every nanny (17 exactly) have run away from them. Simon (Thomas Sangster), the oldest brother, is the head behind the pranks and he doesn t have a very good relationship with his father. But the solution will be Nanny McPhee (Emma Thompson), a magic nanny who literally falls from heaven to discipline the children and teach them some lessons.