Some how I missed your post, back in 2019! I wish there were some way to get alerts for certain topics.
My sister has been raving about this book lately. I worked as an au pair - YEARS ago - in The Hague and I speak a little Dutch. These are in English but refer to a lot of Dutch culture and words. I found two other books about him at ERHamilton's (online) and am waiting for Book One (that you mentioned above) to arrive from Amazon. The reviews make them all sound wonderful. Can't wait to get started!!