Return of the Jedi By James Kahn

The final part of the Star Wars saga tells the story of the last confrontation between Luke Skywalker and his evil father Darth Vader, as well as the rebels' final battle against the Dark Empire.
The story begins in the palace of the monstrous Jabba the Hutt, who holds both Han Solo and Princess Leia as prisoners for his own decadent pleasure. Until Luke Skywalker appears on the scene and frees his friends.
The plot changes, and the rebels are already confronted with a new, even more gigantic Death Star than in the first part, on which the final battle of good against evil is
fought. To prepare for the destruction of the Death Star, the rebels pull their troops together.
As a vanguard, Luke Skywalker, Han Solo and Princess Leia finally land on the forest moon Endor, in this orbit the still imperfect Death Star draws its
rounds. There they get help from the Ewoks. In the final battle, the gigantic armada of the rebel ships and the Empire's fleet face each other.
 
- Goodreads Summary