So according to my somewhat hagiographic biography of Graf von Lüttichau the man himself wrote a book about Friedrich Wilhelm IV and his wife Elisabeth Ludovica in 1894. The Graf had been Kammerherr to Elisabeth for the last few years of her life so should have some idea of the subject.
Thanks to the wonder of Abe Books I found a copy, same year and publisher as described in the biography. The binding is not exactly to my taste but it’s an interesting little book nonetheless.