A young Avatar Roku has only just commenced his training at the Southern Air Temple when his erstwhile friend Prince Sozin requests his aid in preventing the Earth Kingdom from claiming a remote Fire Nation island. Despite his inexperience, Avatar Roku slips away with the help of an irritating young Airbender named Gyatso. As the reluctant companions delve deeper into their wayward mission, they begin to realize that even greater threats lie ahead. Plagued by self-doubt but eager to prove himself, Roku fights for his life and the lives of others while ensuring that the hidden secret of the island doesn't fall into the wrong hands.