A spy story almost forgotten to history that is key to understanding the espionage campaign that was waged as Hitler, Stalin, Roosevelt, and Churchill publicly directed the frontlines. Coming together here are the histories of cryptography, Nazi double-agents, and nuclear weapons.

An extensive network of spies and radio operators are gathering intelligence and sending it to Moscow from Western Europe. They are a colourful group of people who go by the name of Die Rote Kapelle, or Red Orchestra.