The year is 1936. In Cambridge, a prominent couple of the gentry are murdered in a horrible manner. History professor Tom Wilde finds himself pulled into the world of espionage when he chooses to look into the killings, wondering if their deaths were related to that of a young woman. She had been found dead in her bedroom holding a silver syringe, not too long after she made an enemy of the Gestapo by delivering some documents to a Jewish scientist.