By Lawrence D. Klausner. It's unclear which "major motion picture" this became -- the book's 40+ years old; all his IMDb/"self" credits are quite recent.
The jacket on this hardcover looks 40+ years old, too -- fraying and splits at top and bottom of spine; rubbing and various dings elsewhere -- but it's done a decent job protecting the boards, and the pages are pretty bright inside; book sits straight.