We call them the Aztecs, and their capital is now Mexico City. They were fierce, intelligent, skilled in the art of war and craft, and yet their well-trained veteran army of hundreds of thousands of soldiers, was no match for a handful of Spanish adventurers who swept away their might empire in almost the blink of an eye. Why was their downfall so sudden? So devastating? So complete? This was, and shall always be, one of the world's greatest mysteries...