No, there weren't. There was never any books until long after the movies. The writer initially called them Eps 4, 5 & 6 to make them seem like a matinee serial (a la Flash Gordon). He later said there should be nine parts in the whole story. He (fifteen years later) went back and wrote the backstory (that became 1-3), and said that 7-9 will never be written. 4-6 is one story, and all in the right order. Any movie-buff should see them, if only because they pretty much changed cinema forever (creating the "summer blockbuster"). The new (prequel) trilogy can be happily ignored as a pretty bad idea.
Back to topic, I'd rather eat my own feet than see the remake of The Wicker Man. Not only is it sacrilege as to a classic British film, but it seems to have been re-worked into a misogynistic diatribe.