Percy Jackson and the Olympian, The Battle of the Labyrinth

The fourth book in the Percy Jackson and the Olympians series. Percy and his friends must navigate the magical Labyrinth of Daedalus to stop Luke's army from invading Camp Half-Blood. Filled with Greek mythology, action, and humor, this fantasy adventure follows demigods facing ancient monsters and impossible challenges as they race against time to save their home and prevent the rise of the Titan lord Kronos.