The last command - Timothy Zahn

The epic story that began with Heir to the Empire reaches its dramatic conclusion in this essential Star Wars Legends novel.

The
embattled Republic reels from the attacks of Grand Admiral Thrawn, who
has marshaled the remnants of the Imperial forces and driven the Rebels
back with an abominable technology recovered from the Emperor's secret
fortress: clone soldiers. As Thrawn mounts his final siege, Han Solo and
Chewbacca struggle to form a coalition of smugglers for a last-ditch
attack, while Princess Leia holds the Alliance together and prepares for
the birth of her Jedi twins.

The Republic has one last
hope-sending a small force into the very stronghold that houses Thrawn's
terrible cloning machines. There a final danger awaits, as the Dark
Jedi C'baoth directs the battle against the Rebels and builds his
strength to finish what he already started: the destruction of Luke
Skywalker.