Shatterpoint

Shatterpoint by Matthew Stover
Author Matthew Stover explores the psychology of Jedi Master Mace Windu as he returns to his home planet to find his missing former apprentice and face the darkness in his own soul. Inspired by the real-world film Apocolypse Now and the classic (non-Star Wars) novel Heart of Darkness.

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This is a prequel era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe). 

Episode III: Revenge of the Sith novelization

Episode III: Revenge of the Sith novelization by Matthew Stover
Author Matthew Stover brings his gritty, emotionally vivid approach to Revenge of the Sith, giving us by far the best Star Wars movie adaptation to date. Stover adds an impressive amount of depth to the characters and events from the film, with the end result in many ways better than the movie itself. Lovers of Episode III will love this book, and haters of Episode III may like it more after reading this book.

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This is a movie novelization from the Legends timeline. Though the movie itself is canon, original content in the book could be contradicted by future books, movies, or TV shows (if so, you can think of it as an alternate universe).

Luke Skywalker and the Shadows of Mindor

Luke Skywalker and the Shadows of Mindor by Matthew Stover
An unusual but intersting novel from author Matthew Stover, known to Star Wars fans for the exceptional philosophical and emotional depth of novels like Shatterpoint, Traitor, and the Revenge of the Sith novelization.

Dismayed by sensational film portrayals of his exploits for the Rebel Alliance, the self-critical Luke Skywalker finds himself caught up in an all new B-movie adventure, facing off against a mysterious dark side foe who has a theatrical side of his own. Luke Skywalker and the Shadows of Mindor is a self-consciously pulpy adventure that winkingly explores the sometimes unclear relationship between reality and fiction (while still staying strictly within the Star Wars universe).

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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 Force Awakens and newer books.