Seventy years ago, the city of Tokyo was hit by an earthquake. It destroyed half a million buildings, provoked national economic collapse and left 140,000 people dead or dying. Another earthquake of the same size could strike at any time. When it does it will obliterate one third of the earth's richest city and plunge the entire world into unprecedented economic crisis. QED shows, in graphic and disturbing detail, the effects the earthquake will have on 14 million people who live in Tokyo and on the fabric of the modern city; it also spells out the impact it will have on life in the rest of the world.