This amazing novel from Ernest Cline features heavy language (f*ck, s*it, a**, b*tch, and every other bad word you could think of). If your kid is a fan of Ernest Cline's work on Buzz Feed, or his massive Internet presence on his blog, expect him/her to become interested in this one. There is a lot of violence, but almost all of it is in a video game, outside of one person's death in real life. I think it does have a positive message, that hard work and teamwork will result in great rewards. There is no sexual content, but there is a brief reference to masturbation (it takes up about half a page) and another brief reference to simulated sexual content. However, the narrator dismisses it as sad and pathetic. A couple of scenes take place in clubs, and two characters order alcoholic beverages, but this is in no way promoting consumption of alcohol. If your kid has already been exposed to offensive language, this should be fine. I, personally, read this when I was 12, and it had no effect on me.