10 years burrowing

Yes, i forgot about that one. One of van Mook's works. The are some others along siimilar lines by his hand also, as well as areport on the functioning of Political Investigation Service, which had been one of his previous projects before the war. Another excellent book is "Nishi no haze, hare" by haslach, albeit that one is more on code breaking, but shows the mindset of the time.