In 1874, she gave birth to her son Lionel and began work on her first major novel, The Lass o' Lowries. The critical response was encouraging, and many reviews compared Burnett's work to that of Charlotte Bronte and Henry James. In 1879 she published her novel Haworth, her first attempt at serious fiction. Later that same year, one of her first children's stories appeared in St. Nicholas, a magazine in which she would publish for years to come. It is at this time that Burnett, who was constantly battling illness, acquainted herself with the philosophies of Spiritualism, Theosophy, Mind Healing, and Christian Science. These philosophies ideas about the healing powers of the mind became a crucial motif in much of her writing, most notably in A Little Princess, The Secret Garden, and The Lost Prince.
In 1886 Little Lord Fauntleroy, the book that transformed Burnett's life, was published. It became a runaway bestseller in America and England. While the success of the book branded Burnett popular and romantic writer rather than a serious artist, it provided her with enough income to free her form an unhappy marriage and allows her to travel through Europe. In 1890 Burnett's first son Lionel was diagnosed with consumption and died that same year. By 1898, Burnett and Swann divorced by mutual consent, and she leased a country house in England where she immersed herself in her passion for gardening. The estate was surrounded by several walled gardens, one of which, a rose garden, served as her outdoor workroom. It was here that the idea of a The Secret Garden was born. .
Over the course of her life, Burnett wrote more than forty books, for both adults and children. While her adult novels are considered to be quite sentimental, her children's books have withstood the fickleness of literary fashions. The Secret Garden, the story of how Mary Lennox and her friends find independence as they tend their garden, has been described as one of the most satisfying children's books ever written.
