Percy Jackson and Annabeth Chase are reunited with their friends after a deathly journey through Tartarus. Coach Hedge, Reyna, and Nico are off to deliver the Athena Parthenos and restore peace between the warring Camp Half-Blood and Camp Jupiter. The seven demigods must reach Athens by August 1st, the Feast of Spes, to stop Gaea from awakening and defeating her army of giants.