In "The Battle of the Labyrinth", more details on Rachel's life are given. She shows up at Percy's new school, Goode High School. She can see that two cheerleaders are really empousai and helps Percy escape from Kelli, one of the "empousai". Later, Percy asks her to help him navigate Daedalus's Labyrinth, a maze he built, to find him. She goes with Percy and Annabeth through the maze. After finding out Daedalus has made a deal with Kronos, she escapes with Percy and Annabeth. Eventually, the three find Kronos's headquarters. Kronos has started to live in Luke Castellan's body and tries to catch Percy. Rachel appears with Annabeth and Nico di Angelo and throws her blue plastic hairbrush at Luke's eye. This confuses Kronos and lets Percy escape. She also helps find Pan, the lost god of nature. She is there when he dies.