The Nazi Connection details Frederick William Winterbotham's work as Chief of the Air Intelligence Department in the British Secret Intelligence Service before World War II. Tasked with gathering intelligence on military aviation in potential adversary nations, Winterbotham focused on Germany, visiting the country multiple times as a civilian Air Ministry official. His apparent sympathy for Nazi ideology allowed him to gather vital information on Germany’s rearmament plans, while building relationships with high-ranking Nazis.

Winterbotham was welcomed by top Nazi officials, including Alfred Rosenberg, and even met Hitler, Hess, and Göring. During his visits, Winterbotham learned about Hitler’s plans to invade the Soviet Union and gained insights into Germany's military preparations, including the emerging concept of blitzkrieg. Despite this critical intelligence, convincing British leaders to heed these warnings proved difficult. Winterbotham’s predictions were dismissed until Germany’s military aggression became undeniable.

The Nazi Connection explores the complex web of espionage and deception surrounding Winterbotham’s mission. It questions how different the course of history might have been if Britain had acted on Winterbotham's intelligence about Nazi Germany’s intentions. This story of missed opportunities and high-stakes intelligence offers a fascinating look into the prelude to World War II.