In "The Treasure of the Tigris," Mockler-Ferryman likely tells a thrilling adventure story set in the ancient land of Mesopotamia, the region between the Tigris and Euphrates rivers, which is often considered one of the cradles of civilization.The novel may follow the exploits of a group of characters who embark on a quest to uncover a legendary treasure hidden amid the sands of Mesopotamia. As they journey through the ancient landscape, they may encounter dangers such as rival treasure hunters, desert nomads, and archaeological mysteries.