Scourge by Jeff Grubb
A Master of Luke Skywalker's restored Jedi Order is out to solve a murder mystery that will pit him against the vilest of scum and villainy in a dangerous game as he submerges himself in the criminal underworld of Hutt Space and beyond. In the process, he will have to come to terms with his own doubts and fears.

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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.