Introduces Hera, Zeus's wife and goddess of air, sky, and the heavens, and the only thing Zeus is afraid of.

Three teens find themselves at the Roman demigod camp. Percy is struggling to find his memory. Hazel deals with a mistake she made that puts the entire world at risk. And Frank, the bulky, clumsy supposed-descent of ancient heroes, can't quite find his place as the trio battle up and down the West Coast in the hopes of stopping an impending disaster.