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1-108
After being attacked by empousai cheerleaders at his new school, Percy returns to Camp Half-Blood and learns about the Labyrinth a part of the palace of King Minos in Crete that was designed by Daedalus. He also meets the camp's new sword master, Quintus. During a battle drill with Giant Scorpions at the camp, Annabeth and Percy accidentally find an entrance into the Labyrinth. Percy soon learns that Luke had used this entrance before and will try and lead his army through the Labyrinth. -
108-187
Using the Labyrinth, Percy, Annabeth, Grover, and Tyson, must find Daedalus to prevent Luke from obtaining Ariadne's String, the tool that would allow Luke to navigate the Labyrinth. Percy and his friends encounter Campe, a half woman, half-dragon creature, Tyson's idol. After an encounter with the goddess Hera and a battle at the farm of Geryon, the group is reunited with Nico di Angelo, and raises his sister's spirit to talk to him. -
187-250
They finally discover that Quintus, the mysterious new sword instructor at Camp Half-Blood, is actually Daedalus, who has attained extended life by putting his life-force, into a robot body and that Kronos has gained enough strength by Luke. He also possess Luke, using his body as a starter form. Kronos finds out that Nico di Angelo is a son of Hades and that he could be the child of the great prophecy, which states that a child of Big Three would decide the fate of the gods. -
250-347
After the battle, Daedalus sacrifices himself to close the Labyrinth. The camp say good bye to the dead, Nico leaves the camp, Grover travels trying to spread the message of Pan. Percy leavesfor his birthday, where he meets Tyson once again,his mother, Sallyand Paul Blowfis. Paul asks Percy for permission to marry his mother. Percy is also confronted by his father, warning him about the devastation that soonapproaches, including the ancient monster, Typhon. Ending with a cliff hanger