Horizon Pictures had a first release that was taken from the novel written by whom?
Horizon Pictures:  The company's first production was the Academy Award-winning "The African Queen", starring Humphrey Bogart and Katharine Hepburn, in 1951. The African Queen (film): The African Queen is a 1951 British-American adventure film adapted from the 1935 novel of the same name by C. S. Forester.
C. S. Forester