This week’s podcast is with Ben Macintyre, the historian whose books read like thrillers. His latest is Colditz : Prisoners of the Castle , an account of the POW prison for those allied servicemen most troublesome for the Nazis. If you think you know the story, though, there is more to it than meets the eye.

We also go on to talk about his other books, which deal with the KGB agent Oleg Gordievsky, the spy who changed history and Kim Philby, the Cambridge spy and traitor.