There are 3 books in the Star Wars: The Thrawn Trilogy - Legends series. The newest book is The Last Command which came out in 1993.

1
Heir to the Empire

Book cover of Heir to the Empire
#1 NEW YORK TIMES BESTSELLER • In this essential Star Wars Legends novel—the first ever to take place after the events of the original trilogy—Grand Admiral Thrawn makes his debut on the galactic stage.

Five years ago, the Rebel Alliance destroyed the Death Star, defeated Darth Vader and the Emperor,…
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2
Dark Force Rising

Book cover of Dark Force Rising
In this essential Star Wars Legends novel, the sequel to Heir to the Empire, Grand Admiral Thrawn’s sinister plan threatens to spell doom for the fledgling New Republic and its most iconic heroes.

The dying Empire’s most cunning and ruthless warlord, Grand Admiral Thrawn, has taken command of the remnants…

3
The Last Command

Book cover of The Last Command
Used but in good condition, nice price. Nice item for your Star Wars Collection. Heir to the Empire series. Feel free to mail questions and good luck. Thanks.