As a dark force engulfs the land, the fate of Erdas has fallen on the shoulders of four young strangers who each have forged a rare bond with their spirit beasts -- a bond that gives great powers to all of them.

Turtle the SeaWing dragon has long dreamed of being a hero, but when the companions inadvertantly free Darkstalker, the oldest and most powerful dragon, from the spell that has trapped him, the best he can come up with is a spell that prevents the ancient dragon from seeing him or hearing his thoughts--Darkstalker claims he has changed, but Turtle suspects that he still plans to control dragonkind.

As the Conquerors try to destroy Erdas, Meilin -- fed up with waiting and ready to fight -- sets off into enemy territory with her spirit animal, a panda named Jhi. Her friends Conor and Abeke aren't far behind ... but they're not the only ones.

Targeted by Interpol after a series of spectacular heists, a reluctant Amy and Dan are ordered by Vesper One to steal the world's largest diamond, a demand that is challenged by their efforts to rescue the Cahill hostages and stop a Vesper mole.

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.

Cast out of the Raven clan, Torak heads to the reedbeds at Lake Axehead, where he is hunted by the hidden people and he must do battle with an ancient evil.

While searching for the three remaining artifact keys, Kendra discovers the location of a key to the vault housing one of the artifacts. In order to retrieve it, however, the Knights of the Dawn must venture into a dragon-filled lair known as Wyrmroost.

Kendra, Seth, and the Knights of the Dawn race against time and face dangers as they try to stop the leader of the Society of the Evening Star from possessing the final artifact needed to release evil from the great demon prison.

Thirteen-year-old Dan Cahill and his older sister, Amy, thought the search for the thirty-nine clues leading to the source of their family's power was over, but when Cahills are kidnapped by the Vespers, Amy and Dan find themselves with only a few days to fulfill a bizarre ransom request before their friends start dying.

When the Vespers continue their abductions and cross a line by kidnapping Atticus, an eleven-year-old non-Cahill civilian and Dan's only friend, Dan and Amy confront their biggest challenge ever in order to keep Atticus alive.