<P> The House of Hades, the fourth book, was released on October 8, 2013 . </P> <P> In Tartarus, Percy Jackson and Annabeth Chase travel towards the "Doors of Death" (the only exit to the mortal world) with help from Bob the Titan, hoping to escape and simultaneously stop more monsters from getting through . In the mortal world, the remaining demigods search for the mortal side of the Doors to help open them . They also meet with Reyna Avila Ramírez - Arellano, a Roman demigod; she, Nico di Angelo, and Coach Hedge leave with the Athena Parthenos for Camp Half - Blood . Once reunited, the original seven sail for Greece, where they expect Gaea's main force will gather . </P> <P> The Blood of Olympus, the fifth and final book in the series, was released on October 7, 2014 . </P> <P> While Reyna Ramírez - Arellano, Nico di Angelo, and Gleeson Hedge travel towards Camp Half - Blood (where the Romans are preparing to attack the Greeks), the seven of the quest travel to Athens . With help from the gods, the demigods defeat the giants in Athens . They then return to the fight on Long Island and Leo Valdez sacrifices himself to defeat Gaea and restore peace . In the final pages, Leo is resurrected by his bronze dragon Festus and goes to find his girlfriend Calypso . Unaware that he is alive, Camp Half - Blood and Camp Jupiter mourn his loss, determining to become allies and prevent such a deadly war from happening again . </P>

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