The seven demigods—Percy, Annabeth, Jason, Piper, Leo, Frank, Hazel, and Nico—face their final mission against Gaea, the Earth goddess who is about to awaken and destroy the world. While some travel to Greece to stop Gaea’s rising army, others must return the Athena Parthenos statue to Camp Half-Blood to prevent a war between Greek and Roman demigods.
Nico, Reyna, and Coach Hedge take on a dangerous journey to transport the statue safely. Meanwhile, Percy and Annabeth fight powerful enemies in Greece, trying to stop Gaea’s final ritual. The group faces many sacrifices, but they remain united despite fear and exhaustion.