Conor, Abeke, Meilin, and Rollan have journeyed across Erdas, racing to stop a merciless foe. Now that journey is about to end. They must reach a place forgotten by time and face off against an ancient enemy breaking free from his prison. They have just one chance to stop him -- or the whole world will shatter.

When Captain Shang is mortally wounded by Shan Yu in battle, Mulan must travel to the Underworld, Diyu, in order to save him from certain death. But King Yama, the ruler of Diyu, is not willing to give Shang up easily.

"A teenage girl leaves home to join the legendary Hunters, who protect the people from the terrifying monsters that have overrun their world"--