Thrawn Ascendancy: Chaos Rising by Timothy Zahn
The new canon adventures of fan favorite Grand Admiral Thrawn continue in this prequel to the first Thrawn novel, part of the new Ascendancy Trilogy. The trilogy tells the story of Thrawn's history in his home region, the Chiss Ascendancy of the Unknown Regions, before joining the Empire. For the first time, we can go in-depth to see Thrawn's formative years, before he was a Grand Admiral or a famed tactical genius.
The book takes place at the same time that the Clone Wars were raging elsewhere in the galaxy, and overlaps with the flashback story in Thrawn: Alliances.
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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 almost all new stories since mid-2014).