Some of the contributors, now well into their retirement, remain resolute in their view of the job – one says: “If we had any doubts, I would shoot you.” He’s laughing, but you know he’s deadly serious. Officials and intelligence officers (some of whom worked behind enemy lines) from various agencies – including MI6, Russia’s SVR, Israel’s Mossad and America’s CIA – talk about the various operations they worked on, including Cold War campaigns and coups carried out by covert agents. Anyone who likes a good spy thriller should head to this documentary series, made by the producers of Spycraft, which delivers tales of derring-do from those involved in dangerous undercover operations.