I remember when that was the only Star Wars sequel! Also they had some other novels like Han Solo At Star's End
In those pre-"I am your father" days Darth Vader was a really cool mysterious character. Was he a robot? An alien...
"Learn from me, if not by my precepts, at least by my example, how dangerous is the acquirement of knowledge and how much happier that man is who believes his native town to be the world, than he who aspires to become greater than his nature will allow." Frankenstein