How does house of hades end?

In "The House of Hades" by Rick Riordan, the story culminates with the heroes, Percy Jackson and Annabeth Chase, successfully navigating the challenges of the Underworld. They reunite with their friends, who have been battling the forces of Gaea and her giant minions. The novel ends on a cliffhanger as the group emerges from the House of Hades, preparing to face the final confrontation against Gaea in the upcoming battle. Their journey solidifies their friendships and highlights themes of sacrifice and courage.