Harry Potter is really good the first book is great its not that long but do NOT watch the movie first... the movie isn't really like the book. The hunger games is great too I'm reading it now. I hope I helped!
Some of the books that you could enjoy reading include Blackwater by Eve Bunting, Heroes by Robert Cormier and The Midwife's Apprentice by Karen Cushman. Another book that has a sophisticated theme is Green Angel by Alice Hoffman. Check out, www.connectedyouth.org/books/index.cfm?booklist=sweet.