The Approaching Storm

The Approaching Storm by Alan Dean Foster
A 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.

Buy from Amazon!

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).

The Medstar Duology

Medstar by Michael Reaves & Steve Perry
Inspired by the real-world sitcom M*A*S*H, this is a lovable pair of books about the varied characters who come together to work at a Republic battlefield hospital during the Clone Wars.

Buy from Amazon:
Medstar I: Battle Surgeons
Medstar II: Jedi Healer

This is a prequel era series 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).