Percy Jackson and the Lightning Thief by Rick Riordan

Percy Jackson is about to be kicked out of boarding school…again. And that’s the least of his troubles. Lately, mythological monsters and the gods of Mount Olympus seem to be walking straight out of the pages of Percy’s Greek mythology textbook and into his life. And worse, he’s angered a few of them. Zeus’s master lightning bolt has been stolen, and Percy is the prime suspect.