One of the problems to be faced by any author who writes of the thinking of living theologians is that he must update his conclusions from time to time as their thinking unfolds, develops, or even changes. To this necessary task Dr. Daniel Day Williams has applied himself in this present volume. His original work in this field was published in 1952. Since then Karl Barth, Paul Tillich and others have continued to be productive and provocative; much writing has been done on the significance of the Dead Sea Scrolls; ecumenical conferences on faith and order have been held; and a great deal of other writing of importance has appeared. Dr. Williams takes account of it all, and works the material into his book in a masterful way. This is an important book for all serious students of contemporary theological thinking.