Percy Jackson and the Lightning Thief by Rick Riordan
Meet Percy Jackson. Half boy, half God, he’s a boy with a whole lot of problems. Even discovering his dad is a Greek God can’t help Percy avoid trouble. In fact, he seems to attract more of it than any of the other demigods at Camp Half-Blood. From vaporising his maths teacher to accidentally angering Zeus, God of the Sky, his problems have a habit of escalating. Luckily, Percy is more than equal to the task.