Interestingly, the book was originally written in Indonesian, where Christoph Barth was working as a missionary. It is apparently still the standard work there and reflects the concerns of this struggling minority.
According to reviews, it bears many similarities to von Rad's Old Testament Theology. I wonder what his father would have thought? I'm reminded of one of Brevard Childs' anecdotes about visiting a lecture by von Rad where Karl Barth was sat near to him:
There was always a sort of tension, even in those years, between those studying the Bible and Barth. I remember one incident in 1952 when Gerhard von Rad gave a lecture in Basel on the "Typological Exegesis of the Old Testament". I happened to be sitting rather near to Barth, and I was interested in his reaction. For me von Rad's lecture was simply glorious, crystal clear and exciting. When he finished, Barth turned around in a half sleepy way to the person next to him and said: "I don't quite get it". This seemed to me an appalling response, and I felt like saying, "Herr Prof., let me explain it all to you". Fortunately, I restrained the impulse. Yet in the years that have passed, and the more I have studied von Rad's lecture, the more I began to understand why Barth found problems, and why it wasn't as clear as I once had thought" (lecture at Yale, 1969).You can read large portions of the book on Google Books.