Burnett achieved her first major success with Little Lord Fauntleroy (1886), the story of an American boy who becomes heir to an English earldom. The book was immensely popular and even influenced children's fashion of the era. Her other celebrated works include A Little Princess (1905), adapted from her earlier novella Sara Crewe, which tells the tale of an orphaned girl's resilience at a boarding school, and The Secret Garden (1911), widely regarded as her masterpiece. This novel follows orphan Mary Lennox as she discovers and restores a hidden garden, symbolizing healing, growth, and hope.
Beyond children's fiction, Burnett wrote numerous adult novels and plays, including That Lass o' Lowrie's (1877). She spent much of her later life on Long Island, New York, where she died in 1924. Her works continue to enchant readers worldwide with their enduring themes of optimism, imagination, and transformation.