London and the City of London are not the same place. London is a metropolis of 8 million people. The City of London is the famous square mile in the middle, with about 7,000 residents but many more businesses. A Corporation older than Parliament, the City of London has played a key historical role in protecting and promoting the interests of finance capital. Secret City investigates the power wielded by the Corporation of London over British economic policy, through which it sustains London's prime position at the hub of global finance capital - not least through control of the majority of the world's tax havens. The film exposes the Corporation's anti-democratic constitution, the ancient laws which allow it function as a state within a state, and thus to promote an illusory promise of economic growth at the cost of the real economy.