Winnie Foster is a young girl from a well-to-do family living in the early 20th century. She feels trapped by her strict upbringing and yearns for freedom and adventure. Winnie is curious and imaginative, often dreaming of exploring the world beyond her family's property. When she meets the Tuck family, who possess the secret of immortality, her life takes a dramatic turn. This encounter leads her to question the nature of life and death, ultimately shaping her understanding of love, sacrifice, and the importance of living fully in the moment.