There are several books that discuss the Mildred Harnack incident and the Red Orchestra. An extremely thorough, lengthy biography of Mildred is contained in Shareen Blair Brysac’s “Resisting Hitler.”
By Shareen Blair Brysac – Resisting Hitler: Mildred Harnack and the Red Orchestra
Anne Nelson’s “The Red Orchestra” focuses on all of the members of this resistance movement and the tumultuous period in Berlin in the thirties and forties.
Red Orchestra: The Story of the Berlin Underground and the Circle of Friends Who Resisted Hitler
Eric Larson’s “In the Garden of Beasts” is a general description of the diplomatic intrigue between the German and American governments, Berlin society in the thirties and the life during this period of Martha Dodd. Mildred Harnack is only mentioned peripherally but any reader with an interest in this topic will undoubtedly find this book fascinating.
In the Garden of Beasts (11) by Larson, Erik [Hardcover (2011)]
For more information on the controversy over Nazi anatomist Hermann Stieve and the disposition of the cadavers of those executed by the Nazis with specific information about Mildred Harnack, see this article in Slate:
What happened to the Remains of Nazi Resister Mildred Harnack? Now We Know.
Both pieces of music heard in this podcast are in the public domain. For more information see:
Erik Satie, Gymnopedie No. 1 (Harp arr.) and
Erik Satie, Gnossienes, No. 1 (piano)