His version of the couple in the Gestapo file, whom he names Otto and Anna Quangel, draft a vivid postcard after their only son dies in combat: “Mother! The Führer has murdered my son. Mother, the Führer will murder your sons too, he will not stop till he has brought sorrow to every home in the world” is the message they leave in the stairwell of an office building across town, hoping the card will be picked up and shared. Soon, they’re writing and delivering a fresh card or two every week to other addresses in Berlin.