A massive earthquake rocks the Midwest. Untold lives are lost and the damage is extensive. In the midst of this disaster a massive sink hole develops off the coast of Chicago. The windy city escaped the worst of the quake but something far worse awaits. A geologist, a college football player, a preacher, a janitor, and a group of tourists are just some of the many people that find themselves in harms way when something Gargantuan attacks the city.