by Radziwill, Catherine, Princess, 1858-1941
https://archive.org/details/firebrandofbolsh00radziala
this is interesting stuff. the author was a east prussian/polish noblewoman (inflation of princes and princesses at the time in germany), who looks over the border to russia right after ww1 and tries to make sense of what is happening there, based on her personal experiences, movements, and acquaintances. i would emphasise the historical context and personal circumstances of the author. and so this author looks back at ww1 and the events leading up to it and paints a very colourful and vivid picture. i dont have the knowledge to fact-check the book - maybe luckily because that allows you to read the book almost as an adventure story (is that allowed 100 years later?).
The facts presented in the following pages may perhaps not be accepted without surprise and wonder as to their authenticity. The world at large has not yet quite appreciated the full extent of the secret intrigues which were carried on in the former German Empire before and during the war. And yet the whole fabric of German politics was built on these intrigues. From the time that Bismarck instituted his famous Bureau of Espionage, these machinations were steadily going on throughout the whole of Europe and in America as well, and it seems desirable that the activity of this bureau in its nefarious work in Russia be exposed in somewhat the same manner as has been done for the United States in that remarkable recent book “The German Secret Service in America.”