The Wrath of God (1972)
Little did I know, until Walter Satterthwait pointed it out to me, that Jack Higgins' The Wrath of God (see below for the related post) was made into a movie with Robert Mitchum and Rita Hayworth (her last movie). Judging by the descriptions in the reader comments, the movie is nothing at all like the novel. Some comments even imply that the movie is a parody, and a number of the mention the humor. If there's humor, it's not in the book. And Frank Langella supposedly chews the scenery. I don't doubt it. One character in the book was clearly a direct steal from Sidney Greenstreet from The Maltese Falcon. Victor Buono plays that character in the movie, which seems like great casting to me. I'd kind of like to see the movie.