Commemorated on 1 plaque
Hier wohnte Arvid Harnack jg. 1901 Verhaftet 7.9.1942 'Hochverrat' Berlin-Plotzensee Ermordet 22.12.1942
English translation: Here lived Arvid Harnack born 1901 Verhaftet 7.9.1942 'Hochverrat' Berlin-Plotzensee murdered 22.12.1942
Genthiner Straße 14, Mitte, Berlin, Germany where they lived