My shelfari is many books i have read. I have read many books, including the "Percy Jackson and the Olympians" series, by Rick Riordin, the "Rangers Apprentice" series, by John Flanagan, "Kane Chronicles", and the "Heroes of Olympus" series, both by Rick Riordan. If i could rate these books in movie ratings, all would be PG for mild language and action violence. I would give them all a 9-10 on a scale from 1-10. I recommend the "Kane Chronicles", "Heroes of Olympus", and the "Percy Jackson and the Olympians" series for ages 10-14. The "Rangers Apprentice" I would recommend for ages 11-15, for mild language. These books are all great and i praise the authors.