Kenneth Ross screenwrote "The Day of the Jackal" based on which author's 1971 novel?
The Day of the Jackal (film): The Day of the Jackal is a 1973 Anglo-French political thriller film directed by Fred Zinnemann and starring Edward Fox and Michel Lonsdale. The Day of the Jackal (film):  Based on the 1971 novel "The Day of the Jackal" by Frederick Forsyth, the film is about a professional assassin known only as the "Jackal" who is hired to assassinate French president Charles de Gaulle in the summer of 1963.
i don't know