Having established a secret base on Atollon, the Ghost crew strengthens the rebel fleet by acquiring new resources and recruits eager to stand against the Empire. However, the Imperial efforts to eliminate the rebellion are now being led by the coldly analytical Grand Admiral Thrawn whose strategic, tactical, and cultural insight make him a threat unlike any the rebels have faced before. Ezra and Sabine take on new roles and challenges as the rebels prepare for their biggest mission yet - a direct assault on the Empire!