Question: What plot did Kurt Freiherr von Plettenberg and Claus von Stauffenberg work together on?
Sentence (from "Kurt von Plettenberg"): Plettenberg belonged to the circle of close friends which included Claus Schenk Graf von Stauffenberg, Johannes Popitz, Ludwig Beck, Ulrich von Hassell, Carl-Hans Graf von Hardenberg and Fabian von Schlabrendorff.
Relevant evidence: No