Gathering intelligence has been an essential occupation for thousands of years. What, in essence, is the other country up to? 1300 BC, the Hittites sent spies to check out the intentions of Tutankhamen's widow - and their instructions were to bring back reliable information. Espionage is not a game for amateurs, yet there are many who do it for love or money - among them, the beautiful dancer, Mata Hari, who discovered that spying was far more dangerous than glamorous.