Premise: Body Snatchers is a 1993 American science fiction horror film directed by Abel Ferrara and starring Gabrielle Anwar, Billy Wirth, Terry Kinney, Meg Tilly, Christine Elise, R. Lee Ermey and Forest Whitaker. It is loosely based on the 1955 novel "The Body Snatchers" by Jack Finney.
Hypothesis: In a round about way, the movie was based on a book.