Burnett gained international fame with Little Lord Fauntleroy (1886), the story of an American boy who unexpectedly inherits an English earldom. The book became a bestseller and even influenced children's fashion of the era. She followed this triumph with A Little Princess (1905), an expanded version of her earlier novella Sara Crewe, which tells the moving tale of a young girl's resilience and imagination at a London boarding school.
Her most enduring masterpiece, The Secret Garden (1911), chronicles the transformation of the orphaned Mary Lennox through the healing power of nature, friendship, and hope. The novel remains a timeless classic, adapted countless times for stage, film, and television. Burnett spent much of her later life in America, where she died in 1924, leaving behind a lasting literary legacy that continues to enchant readers of all ages.