LutheranCatechism.com has added Whitford, David M., “Review of Rittgers, Ronald K., The Reformation of the Keys: Confession, Conscience, and Authority in Sixteenth-Century Germany,” H-German, H-Net Review, January 2005, to the Documents Library.
This review begins with a serious error. 
Its first sentence reads, “In Matthew 16, Jesus promises to give the keys of heaven to the Apostle Peter.” But once you get over that hump, holding in mind that it is wrong, the review still is worth reading. It summarizes in orderly fashion what Rittgers addresses in his book. When you read that summary, in about one and a half pages, you’ll see that Rittgers’ book is worth reading. Consider, for example, this closing paragraph from the review:
In the first chapter, Rittgers notes that the Power of the Keys has been largely ignored in the scholarship of the Reformation. As I read that, I thought that such a claim must surely be impossible. It is like ignoring the proverbial elephant in the middle of the room. And yet, Rittgers is absolutely correct. This book is a welcome remedy to such a striking deficiency.
The thing about Rittgers’ book is that it drives attention to the Office of the Keys, as attention surely should be driven.