Written more than thirty years ago, Werner Herzog's Mexico screenplay - an epic, stylized dramatisation of the conquest of the Aztec empire by Hern?n Cortes and his army in 1521 - is destined to remain unfilmed. But now it can be read. An essential companion piece to the filmmaker's earlier, celebrated South American adventures, Aguirre, the Wrath of God (1972) and Fitzcarraldo (1982), Mexico pits Cortes, "a genius of deception and intrigue,"...