Based on a popular legend in Gansu, the far western province of China, The Tortoise in Asia recounts the exploits of Marcus, a young Roman centurion schooled in the Greek classics who, after a devastating loss in a battle with the Parthians, is taken prisoner, marched along the Silk Road, and pressed into service as a border guard on the eastern frontier. After a daring escape, Marcus has many adventures working with the Hun army as a mercenary. Throughout this harrowing journey, Marcus learns about Chinese philosophies, uncovering the startling similarities between these philosophies and those of Greece.