Hey, history lovers. I'm Mike Rosenwald with Retropod, a show about the past, rediscovered.

October 1937, Germany. The German Chancellor, Adolf Hitler, welcomes a rather well-known couple to his mountain retreat for a cup of tea.

He showed his guests around the property.

They all looked out over the border into Austria, a truly picturesque day.

The visit lasted two hours, then everyone said goodbye.

Hitler gave the Nazi salute.

And so did the man he had welcomed, the Duke of Windsor, who just months before was the King of England.

That visit is still scrutinized by people seeking to answer an unusual question.

Was a member of British royalty collaborating with the Nazis?

That question is hotly debated among royal watchers and historians, and it's even made its way into popular culture through the Netflix series The Crown.

It arose from a cache of German army documents and telegrams discovered after World War

2 ended, what's known now as the Windsor file.

All throughout World War II, German intelligence collected documents about the Duke of

Windsor, the former king. Historians say Hitler liked the idea of working with the Duke.

Hitler knew the former king had an axe to grind with Great Britain.

He had to abdicate his crown to marry an American divorcee.

His country essentially forced him to choose love or the throne.

Plus, the Duke had a reputation for sympathizing with dictators.

A few years prior, he reportedly told a member of German royalty

that the British had no right to interfere with how Germany treated Jews or anyone else.

So, information about the Duke in his supposed Nazi leanings was passed through German spy channels,

detailed in cables, telegrams, and other documents written by the German army

...