What is the main conflict in The Last Command by Timothy Zahn?

The Last Command pits the New Republic against the Grand Admiral Thrawn in a battle for survival. Thrawn's clone production, sped up so much that insanity is guaranteed, must be ended. As Thrawn and the insane Master Jedi Joruus C'baoth vie for control of the Empire, a small band of Rebels flies to the hidden facility and destroys it. Both C'baoth and Thrawn die, so the headless Empire ceases to be a threat.