The High Republic: Midnight Horizon

The High Republic: Midnight Horizon by Daniel José Older
This will be the third young adult novel of the The High Republic publishing program, which tells stories of the Old Republic and the Jedi set 200 years before the Star Wars movies. 
Midnight Horizon is the followup book to Out of the Shadows, and the first book of the series by author Daniel José Older. Older has also been writing many of the High Republic comics, and previously wrote one Star Wars novel, the Han and Lando book Last Shot.

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This is a book from the New Canon timeline! It's guaranteed to be consistent with future Star Wars movies, TV shows, books, and comics (and almost all new stories since mid-2014).