Calum, Kerry Anne and the History Hunters go undercover looking at the gadgets and tactics used by spies. At work, in sport, amongst friends and even family, people have spied on each other since time began. During war and peacetime, spies had clever methods of finding out and hiding secrets.
Join the History Hunters on two undercover missions. They start sleuthing by spying on their little sister. She's talking about them on the phone but to whom, and what is she saying? A homemade periscope may help them see her but they'll need another invention to be able to hear her.
Next, they have to create a secret spy note using invisible ink to draw a map pointing Agent X, and him alone, to the location of some secret spy chocolate. In the studio, Calum and Kerry Anne use everyday items to make spy gadgets like a book safe and a note hidden in an olive. They also learn to write and break codes using a Roman-inspired Caesar cipher code strip.
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