The Sea of Monsters is the second book in the Percy Jackson and the Olympians series. In this adventure, Percy Jackson returns to a quieter seventh-grade school year after a summer spent working to stop a big war among the Greek gods. Although he enjoys the peace, he soon learns that danger lurks just beneath the surface. His world is turned upside down when he discovers that the protective barrier around Camp Half-Blood, the safe haven for demigods, is failing. Monsters once again threaten his friends and the camp's very existence.

With his friends by his side, Percy embarks on a dangerous journey to recover the mythical Golden Fleece, which holds the power to restore the camp's protection. Along the way, he faces treacherous creatures and encounters familiar foes, all while unraveling the mysteries of his identity and heritage. Themes of friendship, bravery, and the struggle between good and evil shine through as Percy navigates both the monster-filled world of Greek mythology and the challenges of growing up. Join Percy on this thrilling quest filled with action, humor, and heart, as he learns what it truly means to be a hero.