Crucible by Troy Denning
Forty years after Return of the Jedi, Luke, Han, and Leia go on one last adventure together, facing off against twin geniuses with a taste for evil experiments and a hunger to dominate the galaxy through corrupt corporate expansion.
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This is a post-Return of the Jedi novel from the Legends timeline. Think of it as an alternate universe from the sequel movies and newer books.
I want to read Star Wars books about...
Ahsoka Tano Anakin Skywalker ancient galactic history Ancient Jedi Ancient Sith Asajj Ventress blood & gore Boba Fett bounty hunters Chewbacca Chiss cloning Darth Maul Darth Vader Dash Rendar Dooku everyday citizens fallen Jedi female lead characters fighter pilots Finn galactic mysteries Grand Admiral Thrawn Grand Moff Tarkin Han & Leia Han Solo heist capers Hutt Jedi Jacen Solo Jedi Jedi clones Jyn Erso Kit Fisto Kylo Ren Lando long-lost civilizations Luke Han & Leia Luke Skywalker Mace Windu Mandalorians Mara Jade minor movie characters new characters New Republic (canon) Obi-Wan Kenobi Order 66 Original Trilogy-Prequel links other Force users Padme Amidala Palpatine pirates Poe Dameron Prince Xizor Princess Leia Qui-Gon Jinn Revan Rey Rogue Squadron scum & villainy secret agents Sith Lords stormtroopers/clonetroopers superweapons the Clone Wars the criminal underworld the dark side the Death Star the Empire the First Order the Force the Hutts the Old Republic era the Rebellion the Republic the Resistance the Yuuzhan Vong Unknown Regions Wedge Antilles Wild Space wise-talking droids Wraith Squadron Yoda zombies