In a London that has changed over time, Michael Banks, now an adult and with three children, faces loss and a lack of joy in his life. After a series of financial and emotional setbacks, the last thing he could imagine is that the magic of his childhood is about to return. When he finds himself in a desperate situation, a magical nanny appears, ready to turn his world around; she is a ray of hope that will bring back the joy and fantasy that has been so absent in his home.
With the help of his clever sister Jane and the inseparable companionship of a charismatic chimney sweep named Jack, the nanny teaches the Banks how to rediscover happiness in everyday life. Through colorful and enchanting journeys that cross time and space, the magical nanny shows them that even in the darkest moments, there is always room for wonder and joy.
But the journey is not just about laughter and games; the Banks must confront their fears and a past that could ruin their future. The film intertwines memorable songs and dazzling animation with a powerful message about family and resilience. As the story unfolds, the magic of the nanny and the love of family demonstrate that sometimes what we need most is a little help to remember what truly matters.