One of the most helpful books I have ever read, in terms of making sense of the unity and Christo-centricity of the Scriptures, is Graeme Goldsworthy's According to Plan: The Unfolding Revelation of God in the Bible. Since then, I have read many of Goldsworthy's books (and found them all extremely beneficial). I would highly recommend According to Plan (for anyone wanting to gain a better understanding of the basic plot-line of the Bible) and The Goldsworthy Trilogy (especially for pastors or Sunday School teachers).
Over the weekend, I had the opportunity to listen to a recent White Horse Inn interview with Dr. Goldsworthy, which I would also recommend to you.
