Should spies be suave gentlemen or streetwise crooks? Today, Astrid and Anna introduce you to two of MI6's original gangster spies, Walter Dicketts and Arthur Owens. They quickly bring some impressive results. But, the thing about criminals is that it can be hard to trust them. Just a couple of years into the war, MI6's Double Cross System might be in a lot of trouble...

Geoffrey Pyke is remembered as an eccentric scientist who spewed out ideas like giant aircraft carriers made of icy Pykerete. But there was much more to him than that. He was a spy, a special operations mastermind, and his novel ideas contributed to the success of D-Day.