My son is a very good reader and is utterly obsessed with Harry Potter. He has been reading my old copies and he has now finished the third and wants to start the fourth (Goblet of Fire). I'm just worried that it may be too mature for him. It is 600 odd pages, there is death and it's a lot darker than the previous three books. He is very mature for his age and has seen all the films so knows what to expect but I was hoping for some opinions?