Catching Fire was later released in ebook and audiobook format. "Catching Fire" received mostly positive reviews, with reviewers praising Collins' prose, the book's ending, and the development of Katniss's character. According to critics, major themes of the novel include survival, authoritarianism, rebellion and interdependence versus independence. The book has sold more than 19 million copies in the U.S. alone. A film adaptation, "", was released on November 22, 2013. After winning the 74th Hunger Games in the previous novel, Katniss Everdeen and Peeta Mellark return home to District 12, the poorest sector in the country of Panem. On the day that Katniss
The Hanging Tree (The Hunger Games song) days" during the month of September 2013. Lawrence later contacted both Schultz and Fraites via text message that the melody was chosen for the film, saying, "It worked out great in the movie. We just shot the scene. Jen was really nervous but it went great." The lead protagonist Katniss Everdeen performs the song in the film, which is also heard over the closing credits. Jennifer Lawrence revealed on "Late Night with David Letterman" that she was anxious about singing the song in the film, citing her fear of "singing in front of other people" as her reason; she also