Who wrote the novel that a movie from 1969 is based on which was directed by the same director who also directed the movies "missing" and "Hanna K."?
Costa-Gavras: Costa-Gavras (short for Konstantinos Gavras; Κωνσταντίνος Γαβράς; born 12 February 1933) is a Greek-French film director and producer, who lives and works in France. Costa-Gavras:  He is known for films with overt political themes, most famously the fast-paced thriller "Z" (1969), but he has also made comedies. Costa-Gavras:  Most of his movies have been made in French; however, six were made in English: "Missing" (1982), "Hanna K." (1983), "Betrayed" (1988), "Music Box" (1989), "Mad City" (1997) and "Amen. Z (1969 film): Z is a 1969 Algerian-French epic political thriller film directed by Costa-Gavras, with a screenplay by Gavras and Jorge Semprún, based on the 1966 novel of the same name by Vassilis Vassilikos.
Vassilis Vassilikos