Chapter 16: "The Fury":
* Percy and Annabeth, along with Tyson, reach the island of Polyphemus, the Cyclops.
* They are met by a monstrous creature, a Fury, who reveals her connection to the Oracle's prophecy and her desire to capture Annabeth.
* The Fury uses her powers to create illusions, trying to break Annabeth's spirit and make her surrender.
* Percy, aided by Tyson's strength, fights the Fury and eventually defeats her, saving Annabeth.
Chapter 17: "The Cyclops":
* Percy, Annabeth, and Tyson reach the Cyclops' cave, where they are immediately attacked by the giant's sheep.
* They manage to escape and hide, discovering that the Cyclops is blind and easily manipulated.
* Using their wit, they create a plan to distract the Cyclops, steal his magical ram, and escape the island.
* They successfully execute their plan, leaving the Cyclops confused and angered.
Chapter 18: "The Golden Fleece":
* Percy and Annabeth, along with Tyson, set sail on the stolen ram, heading towards the Golden Fleece.
* They encounter another monster, a giant squid, that attacks their ram.
* The ram, guided by instinct and the Golden Fleece's power, fights back and eventually defeats the squid, saving the trio.
* They finally reach the island of Thalia's Pine, where the Golden Fleece is located, and face a new challenge: the vengeful Fury and her deadly allies.