Queen's Hope by E.K. Johnston
This is the third young adult novel in author E.K. Johnston's Padmé Amidala series, after Queen's Shadow and Queen's Peril. In this one, the Clone Wars have arrived, and Padmé must come to terms with her role as a peace-loving politician during a time of brutal violence.
This book takes place between Attack of the Clones and The Clone Wars movie and TV show, and right before the Obi-Wan and Anakin novel Brotherhood.
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This is a book from the New Canon timeline! It's guaranteed to be consistent with future movies, TV shows, books, and comics (and most stories since mid-2014).