Behind the imposing walls of Colditz Castle, during the second world war, hundreds of foreign officers were kept under lock and key.

But despite the impressive facade, it wasn't the most successful prison: dozens of successful escapes were made by the prisoners there, and many more were attempted.

The myth around the camp is of British derring-do, but the people in the camp were far more diverse than the legends suggest.

In his new book, Colditz: Prisoners of the Castle, Ben Macintyre sets out to widen the narrative.