Duty is the eighth and final episode of the British TV series "Hornblower", based on the book "Hornblower and the Hotspur" by C.S. Forester.
 It was released on 6 January 2003, nearly four years after the first four films, nine months after the next two films, and a day after episode 7: "Loyalty".
The African Queen is a 1951 British-American adventure film adapted from the 1935 novel of the same name by C. S. Forester.
 The film was directed by John Huston and produced by Sam Spiegel and John Woolf.
 The screenplay was adapted by James Agee, John Huston, John Collier and Peter Viertel.
 It was photographed in Technicolor by Jack Cardiff and had a music score by Allan Gray.
 The film stars Humphrey Bogart (who won the Academy Award for Best Actor – his only Oscar), and Katharine Hepburn with Robert Morley, Peter Bull, Walter Gotell, Richard Marner and Theodore Bikel.
Eagle Squadron is a 1942 American war film directed by Arthur Lubin and starring Robert Stack, Diana Barrymore, John Loder and Nigel Bruce.
 It was based on a story by C.S. Forester that appeared in "Cosmopolitan" magazine, and inspired by media reports of the fighting in the Battle of Britain, in particular, the American pilots who volunteered before the United States entered World War II, to fly for the Royal Air Force in the actual Eagle Squadrons.
The Gun is a novel by C.S. Forester about an imaginary series of incidents involving a single eighteen-pounder cannon during the Peninsular War (1807-1814.)
 The book was first published in 1933 and has as its background the brutal war of liberation of Spanish and Portuguese forces (regular and partisans) and their English allies against the occupying armies of Napoleonic France.
The Last Nine Days of the Bismarck (Little Brown, 1959), also published as Hunting the Bismark (Michael Joseph, 1959), was written by C.S. Forester (1899-1966), the author of the popular Horatio Hornblower series of naval-themed books.
 Closely based on the actual naval battle, the book is a novel with fictionalized dialogue and incidents.
Commandos Strike at Dawn is a 1942 war film directed by John Farrow and written by Irwin Shaw from a short story entitled "The Commandos" by C.S. Forester that appeared in Cosmopolitan Magazine in June 1942.
 Filmed in Canada, it starred Paul Muni, Anna Lee, Lillian Gish in her return to the screen, Cedric Hardwicke and Robert Coote.
Retribution is the sixth episode of the British film series Hornblower.
 It was released on 25 March 2002, nearly three years after the first four films and the day after the fifth episode, "Mutiny", of which it is a continuation.
 It is based on the book "Lieutenant Hornblower" by C.S. Forester.
Mutiny is the fifth episode of the British film series "Hornblower".
 It was released on 24 March 2002; nearly three years after the first four films.
 It is based on the book "Lieutenant Hornblower" by C.S. Forester.
White Hunter Black Heart is a 1990 American adventure drama film directed by and starring Clint Eastwood and based on the 1953 book of the same name by Peter Viertel.
 Viertel also co-wrote the script with James Bridges and Burt Kennedy.
 The film is a thinly disguised account of writer Peter Viertel's experiences while working on the classic 1951 film "The African Queen", which was shot on location in Africa at a time when location shoots outside of the United States for American films were very rare.
 The main character, brash director John Wilson, played by Eastwood, is based on real-life director John Huston.
 Jeff Fahey plays Pete Verrill, a character based on Viertel.
 George Dzundza's character is based on "African Queen" producer Sam Spiegel.
 Marisa Berenson's character Kay Gibson and Richard Vanstone's character Phil Duncan, are based on Katharine Hepburn and Humphrey Bogart, respectively.
The Frogs and the Lobsters (a.k.a.
 The Wrong War) is an episode of the television program "Hornblower".
 It is set during the French Revolutionary Wars and very loosely based on the chapter of the same name in C.S. Forester's novel "Mr. Midshipman Hornblower" and on the actual ill-fated Quiberon expedition of 1795.
 The main title is based on the often derogatory term for the French used by the British (as well as other English speakers) and on the red coats of the British soldiers.
 The secondary title deals with Horatio's own duty to the Crown and the alliance with the French and his struggle with his own sympathy towards the French revolutionaries.

Question: What film is a story based on a book about another film that was originally a Novel by C.S. Forester written in 1935? 
Answer: White Hunter Black Heart