Bloodline by Claudia Gray
A prequel to The Force Awakens, this books follows Princess Leia six years before the film, when she was still a Senator for the New Republic. It tells the story of how she came to leave the senate, setting the stage for the formation of the Resistance.

From the author of the beloved young adult novel Star Wars: Lost Stars (though this is a regular novel, not a young adult book).

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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).