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 the Resistance was formed to fight against the First Order.

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).