At their camp, Percy Jackson and Annabeth Chase start their quest the Labyrinth.
They start a quest to find Daedalus inside the Labyrinth so they can convince him not to help their enemy. They find an exit after beginning their underground adventure, but they encounter the horrible monster, Kampe!
After more time in the Labyrinth, Percy and Annabeth arrive at Triple G Ranch, where Percy makes a deal to clean the stables so the monster-farmer will let Annabeth go.
After freeing Annabeth, the two friends go back into the Labyrinth and find Daedalus, but they have to fight a few monsters.
Then, they start the journey back to camp. On the way, they witness the evil Titan lord Kronos rise again!
When they get back to camp, Percy and Annabeth have to battle Kronos' monster-army with the other campers. Some campers are killed or injured, but in the end the campers are victorious.