Children of the Jedi

Children of the Jedi by Barbara Hambly
Not long after the events of the Jedi Academy Trilogy, Han and Leia are searching for a lost group of Jedi children. Meanwhile, Luke must find a way to stop an aging computerized superweapon, even as he falls in love with an Old Republic Jedi whose mind is trapped inside the computer.

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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.