When Ka, the time-travelling cat, vanishes, she leaves a word on Topher's computer: Tenochtitlan. Topher is horrified. That was the home of the bloodthirsty Azlees! Can he escape before the ruthless Spanish conquistadors destroy Tenochtitlan? In this fast-moving adventure Topher meets Montezuma, the legendary Aztec chief and Cortes, the famous Spanish explorer.