In "Christ of the Covenants", O. Palmer Robertson treats a subject which is often lost on today's broadly evangelical church - the Covenant of Grace, by which God has saved and will save His people.
This is not a "light" book, but a treatment of the theology of the Covenant which is accessible to most, nonetheless. It is not terribly scholarly, but does take a more academic tack on the subject than most books. Given this caveat, this is a tremendous resource for those who wish to convey this subject to small group or other audiences within the church.
In this book, Robertson traces the development of God's covenantal dealings with humanity - through the various administrations connected with Abraham, Moses, David and Christ. Each administration, Robertson emphasizes with great aplomb, is not indicative of different covenants (with different requirements, or rewards, as some segments of the church teach), but in fact different reflections of the same Covenant of Redemption that finds its highest fulfillment in Christ and the New Covenant.
This work was truly a joy to read, and a refreshingly intense study of a very important subject. Again, I would recommend this to any pastor, elder, or lay teacher who wishes to take up the subject of Covenant theology in their church or home bible study group.