Truman Capote and Harper Lee were childhood friends in Monroeville, Alabama. Truman was supposedly the model for Dill in To Kill a Mockingbird, and Harper was the model for Idabel Thompkins, a character in Capote's first novel, Other Voices, Other Rooms, published in 1948. Harper also did a lot of research for In Cold Blood.
Now, Greg Neri, an American YA author, has written a book based on that friendship; the book, entitled Tru & Nelle, is scheduled for release in March of 2016.
There is that wonderful biographical film about Truman, entitled Capote and starring Philip Seymour Hoffman, in which Nelle Harper Lee is portrayed. Harper is played by Sandra Bullock in another film about Truman entitled Infamous. Will there one day be a film about their childhood?