Percy Jackson and the Olympians: The Battle of The Labriynth

The Battle of the Labyrinth is the fourth novel in the Percy Jackson & the Olympians series, where Percy and his friends embark on a quest through the Labyrinth to stop Luke and Kronos's army from invading Camp Half-Blood. They must navigate the dangerous maze, a shifting underground world filled with monsters and other challenges, to find the mythical inventor Daedalus and prevent the army from using his entrance. Key events include Percy enlisting the help of the mortal Rachel Elizabeth Dare, Grover's search for the god Pan, and a final battle at Camp Half-Blood that ends with Daedalus sacrificing himself to seal the Labyrinth forever