Series
There are 3 books in the The Thrawn Trilogy series.
Grand Admiral Thrawn, the Empire's most brilliant tactician, has seized control of the Imperial remnant and mounted a campaign to destroy the New Republic. With forgotten superweapons at his disposal, Thrawn is the kind of enemy who thinks three moves ahead. The definitive Star Wars Expanded Univers
The 2 books listed here total 935 pages.
The Books Oracle — track the series you are partway through, and see what to read next.