To fill in the blanks between 1983's "Star Wars: Return of the Jedi" and December's "The Force Awakens," roughly 20 new "Star Wars" novels will hit shelves this fall, Entertainment Weekly reports.

Released by Disney Worldwide Publishing and Lucasfilm Press, the books -- geared toward adults, teens and children -- will form a new expanded universe. They're a collaboration between novelists, editors and screenwriters and filmmakers from the Lucasfilm brain trust.

"The partnership with the story group and the editorial team always had to be true to the sanctity of the film while making sure that we find these moments to introduce hints, clues, and puzzle pieces," Andrew Sugerman, executive vice president of Disney Publishing Worldwide, said in a statement. "Without revealing what those pieces are, it will just allow readers to speculate about the new film: What could a location mean, or what could a character mean?"

As the books are still in the final writing and editing stages, plot details are scarce and closely guarded. However, a few authors and titles have been revealed:  "Moving Target" by Cecil Castellucci, which centers on Princess Leia; "The Weapon of the Jedi" by Jason Fry  about Luke Skywalker; "Lost Stars" by Claudia Gray, author of the "Evernight" fantasy series; and Greg Rucka's "Smuggler’s Run," which follows Han Solo.

Marvel will also get in on the action, releasing one prequel called "Star Wars: Journey to the Force Awakens" and a preview story from C-3PO’s perspective.

"Star War: The Force Awakens" opens Dec. 18.