It`s the 21st century, but the gods of Mount Olympus and assorted monsters have walked out of the pages of high school student Percy Jackson`s Greek mythology texts and into his life. And they`re not happy: Zeus` lightning bolt has been stolen, and Percy is the prime suspect. Even more troubling is the sudden disappearance of Percy`s mother. As Percy finds himself caught between angry and battling gods, he and his friends embark on a cross-country adventure to catch the true lightning thief, save Percy`s mom, and unravel a mystery more powerful than the gods themselves.