Queen's Shadow by E.K. JohnstonThis is the first-ever full-length novel focused on Padme, a.k.a. Queen Amidala. It tells the surprisingly-engaging story of her transition from planetary queen to galactic senator, and explores her relationship with her squad of handmaidens/elite bodyguards.
Though officially a young adult novel, Queen's Shadow is 350 pages long and a part of the same more-mature publishing line as Lost Stars, Ahsoka, Most Wanted, and other great books.
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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 all new stories since mid-2014).