After stealing Hades's Helm of Darkness and narrowly escaping the Underworld, Andy and Zoey are ready to embark on the second quest they must complete before they're prepared to lead a war on the gods-that is, traveling to Poseidon's undersea palace and stealing the Sea God's legendary Trident. Having no idea how to get there, the teens and their friends travel to the lair of the all-knowing Fates and ask for a clue, soon discovering the only person who can help them is a Titan named Prometheus who's been imprisoned by Zeus. ? He won't help unless the group manages to free him of his seemingly unbreakable chains.