The book, The Lightning Thief, by Rick Riordan is about a young demi-god, Percy Jackson, on a quest to clear his name and prevent a war of the gods. He is accused of stealing Zeus's master bolt and later in the book he is also accused of stealing from Hades. As a son of Poseidon, one of the Big Three Gods (Zeus, Hades, Poseidon), he's accused of stealing from two of them, and if he doesn't return them before the summer solstice, there will be a war that would turn the world upside down. On his quest, he makes some friends, fights some monsters, and learns what matters the most in the end.