The High Republic: Into the Dark by Claudia Gray
Published alongside the first High Republic adult novel, Light of the Jedi, this is a tie-in story written for mature young adult readers by Claudia Gray, well-regarded author of Lost Stars, Leia: Princess of Alderaan, and other Star Wars stories.
Into the Dark is part of new The High Republic publishing program, telling stories of the Old Republic and the Jedi set 200 years before the movies. In this case the story follows a bookish Jedi apprentice who's drawn into galactic events against his will, entwined in a dangerous mystery in space.
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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).