The Approaching Storm by Alan Dean FosterA lead-in novel taking place just before the Episode II: Attack of the Clones movie, focused on showing the relationship between Obi-Wan Kenobi and his now-adult Padawan Anakin Skywalker during their mission on a remote planet. Jedi Master Luminara Unduli and Padawan Barriss Offee also play major roles in the story.
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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).