Seven Days In May by Fletcher Knebel (1962)
Seven Days in May is a political thriller novel written by Fletcher Knebel and Charles W. Bailey II and published in 1962. It was made into a motion picture in 1964, with a screenplay by Rod Serling, directed by John Frankenheimer, and starring Burt Lancaster and Kirk Douglas. The story is said to have been influenced by the right-wing anti-Communist political activities of General Edwin A. Walker after he resigned from the military. The author, Knebel, got the idea for the book after interviewing then-Air Force Chief of Staff Curtis LeMay.