This week we look at how someone becomes a spy. While recruitment into a modern intelligence organisation is fairly mundane these days, there used to be some very unique ways of going about it. And being recruited to act as an agent is even more complicated and extreme. So what is the difference between an agent and an intelligence officer? How is a potential agent approached? Why are academics and students such attractive targets? And what is the last thing you would think could be used as invisible ink?
Keep the tissues handy this week!

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