Robert Kimmel Smith's novel eventually got produced as the 1994 CBS TV movie starring James Woods, Anne Archer, Missy Crider and Graham Beckel. An Aaron Spelling production, it was directed by Glenn Jordan.
The fascinating story of fashion model and talk radio personality Candy Jones (a.k.a. MKUltra-controlled CIA courier "Arlene Grant") has, incredibly, never been made into a motion picture, although 20th Century Fox had one in development when this ad for Donald Bain's nonfiction bestseller appeared in the New York Times.
Larry Collins and Dominique Lapierre's first bestselling book, Is Paris Burning? (1965), became the René Clément film IS PARIS BURNING? (1966), scripted by Gore Vidal and Francis Ford Coppola and starring Kirk Douglas, Glenn Ford, Gert Fröbe, Orson Welles, Anthony Perkins, Robert Stack, Charles Boyer, Yves Montand, Leslie Caron, Jean-Paul Belmondo, Simone Signoret, and Alain Delon, but the major motion picture based on O Jerusalem! was never produced.