The Knights of the Abyss are still causing chaos in Atlantis. They threatened that if Trey Atlas doesn't relinquish his throne, they'll light the Echinodea--a magical lantern that could expose the island to the entire world. But if Trey steps down, the Knights would take over Atlantis and destroy everything it stands for; including erasing Trey's mysterious past. So there's only one option--get to the Echinodea before the Knights of the Abyss. While on their search for the Echinodea, Trey and his Royal Court meet someone who claims to have the information Trey seeks about his biological family. But the key to the mystery isn't what he hoped it would be. It turns out that the secret in Trey's blood could steal the very throne he fights to protect.