"The Treasure of the Tigris: A Tale of Mesopotamia" by A. F. Mockler-Ferryman is a historical adventure novel written in the early 20th century. The story follows Walter Henderson, a young man who, after being unable to pursue a military career, finds himself drawn into an archaeological expedition to Babylon, where he is tasked with locating the fabled Golden Girdle of Queen Sophana. As Henderson embarks on his journey across the ancient lands of Mesopotamia, he encounters a blend of history, adventure, and the rich tapestry of local cultures. The opening of the tale introduces Walter Henderson as he adjusts to life as a private secretary to his uncle, a Babylonian historian. Feeling out of place and yearning for adventure, Walter seizes an unexpected opportunity to travel to Babylon for an archaeological quest. His mission becomes clearer when he learns that he must locate a legendary golden girdle associated with Queen Sophana. Along the way, he meets various characters, including a German shipmate and a British consul, who become part of his journey into the desert and provide a backdrop for the unfolding adventure filled with intrigue, local lore, and the essence of Mesopotamian history. (This is an automatically generated summary.)