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).

Order 66: A Republic Commando Novel

Order 66: A Republic Commando Novel by Karen Traviss
In the final novel of the Clone Wars Republic Commando series, the clone commandos become caught up in Palpatine's scheme to destroy the Jedi, who have been their allies throughout the war. The story overlaps with Episode III: Revenge of the Sith.

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Story continued in Imperial Commando: 501st. 

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).