In book four, the Labyrinth of Daedalus is discovered. Camp Half-Blood is in danger of being invaded by Kronos' army by means of the Labyrinth. Chiron sends Annabeth along with Percy, Grover, and Tyson into the Labyrinth on a quest to find Daedalus. In this, they hope to use his knowledge to help thwart any attacks that are carried out using the giant underground maze. They eventually find Daedalus, who has made himself a new body, and has disguised himself as the swordplay counselor.