The Little White Bird is a novel by J. M. Barrie, published in 1902, ranging in tone from fantasy and whimsy to social comedy with dark aggressive undertones. The book attained prominence and longevity due to several chapters written in a softer tone than the rest of the book, in which it introduced the character and mythology of Peter Pan. Those chapters were later published separately as Peter Pan in Kensington Gardens as a children's book. The Peter Pan story began as one chapter of a longer work and during the four years that Barrie worked on the book prior to publication, grew to an "elaborate book-within-a-book" of over one hundred pages.