is about to be kicked out of boarding school... again. And that's the least of his troubles. Lately, mythological monsters and 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. Now Percy and his friends have ten days to find and return Zeus's stolen property and bring peace to a warring Mount Olympus. But to succeeded on his quest, Percy will have to do more than catch the true thief: he must come to terms with the father who abandoned him; solve the riddle of the Oracle, which warns him of betrayal by a friend; unravel a treachery more powerful than the gods themselves.