The House of Hades Novel by Rick Riordan

*The House of Hades* by Rick Riordan is the fourth book in *The Heroes of Olympus* series. The story follows a group of demigods—Jason, Piper, Leo, Percy, and Annabeth—as they face perilous challenges in both the mortal world and the Underworld. Percy and Annabeth are trapped in the House of Hades, trying to close the Doors of Death, while the others must journey to rescue them. Along the way, the group confronts monsters, ancient enemies, and the growing threat of Gaea, the Earth Mother, as they race to prevent a catastrophic war. The novel is filled with action, mythology, and themes of friendship, loyalty, and sacrifice.