It’s five years after the Rebel Alliance destroyed the Death Star, defeated Darth Vader and the Emperor, and drove the remnants of the old Imperial Starfleet to a distant corner of the galaxy. Princess Leia and Han Solo are married and expecting Jedi twins. And Luke Skywalker has become the first in a long-awaited line of Jedi Knights.
Personally, I’d read this book to get a general idea of how Grand Admiral Thrawn is. It is the first book of this character by Timothy Zahn.