The tools in a spy's arsenal are more varied than you might think. But they all come under one name: Tradecraft.

In our ninth round of insights from the world of espionage, Rhiannon Neads looks back on lessons drawn from intrepid cyber-cops, nuclear double-dealers, crafty codebreakers and more.

From SPYSCAPE, the HQ of secrets. A Cup And Nuzzle production. Series producer: Joe Foley. Produced by Alex Burnard. Music by Nick Ryan.

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