Try Sonlight.com reader lists for age appropriate books that are acceptable from a Christian perspective. Some of the books on the list are fun fiction, like Encyclopedia Brown, Misty of Chincoteague, Little House on the Prairie, etc. I would recommend Christian Book Distributors online for adolescent books as well. In lieu of Goosebumps, my children read the Christian fiction author Frank Peretti's children series. My son, who is now 22, says those are still his favorite all time books. My daughter liked the American girl series.