berlin, germany, husband wife relationship, based on novel or book, businessman, chocolate, identity, paranoia, identity crisis, attempt to escape, painter, republic of weimar, alienation, antisemitism, mental illness, madness, assumed identity, doppelgänger, insurance policy, double, vagrant, nazism, russian emigre, murder plot, 1930s, perfect murder, self image, film within a film, performative, dissociation, jewish ancestry, jewish wife, rise of fascism, rise of nazism, victimhood,