Heroes of Olympus: The House of Hades

The fourth book in Rick Riordan's Heroes of Olympus series follows seven demigods on a quest to prevent Gaea from awakening and destroying the world. The story features diverse representation including Nico di Angelo, a gay demigod who struggles with his identity and feelings for Percy Jackson, alongside characters from various cultural backgrounds including Greek, Roman, and other mythologies. Major themes include acceptance of one's identity, the power of friendship and teamwork, and overcoming personal fears and insecurities while facing seemingly impossible odds.