In addition to what has already been suggested, I reccomend a novel, Jayber Crow by Wendell Berry. It touches on many religious themes that are agreeable to Orthodox theology, takes place in a southern community, and is one of the best pieces of literature I've ever read. If you look back in this forum, I've created a thread about it.
Also, C.S. Lewis as others have suggested is very good(especially The Screwtape Letters and Till We Have Faces), Father Arseny is a must read, and perhaps Ascending the Heights by Fr. John Mack followed by The Ladder of Divine Ascent.