Was John movie Eldorado ever written as a book?

There is no movie called "Eldorado" starring John. You may be thinking of a different movie, or perhaps a different actor.

Could you please provide more information about the movie you're thinking of? For example:

* What is the full title of the movie?

* What year was it released?

* What is the plot of the movie?

* Who else stars in the movie?

With more information, I can help you figure out if it was ever written as a book.