The Percy Jackson series is about a young teenager, only he isn't a real teenager at all. What he is in fact is a half-blood, someone who has a greek God as one parent and a mortal human as another. Percy's God father is one of the big three, his father if Poseiden, the God of the sea. There are five books in the series, though the fith one is still to be published. Anyone with a sense of humour and adventure will love these books.