The Hand of Thrawn Duology

The Hand of Thrawn Duology comprises two novels by Timothy Zahn. Set in 19 BBY, the two books explore the end of the Galactic Civil War. While some forces in the Imperial Remnant, led by Admiral Gilad Pellaeon attempt to make peace with the New Republic, another group, led by Moff Disra and an apparently resurrected Grand Admiral Thrawn, attempts to destabalize the New Republic. They do this by bringing to light the Caamas Document, containing evidence that the Bothans were guilty of helping Emperor Palpatine all but exterminate the Caamasi people. Meanwhile, Mara Jade and Luke Skywalker investigate a mysterious fortress at the edge of the galaxy.

The Hand of Thrawn Duology were the final Star Wars novels, in both chronological and publication order, to be published by Bantam Spectra before Del Rey regained the Star Wars license. As such, it is responsible for wrapping up old storylines and setting the stage for the New Jedi Order series.