They thought the case was solved. When an eminent Egyptologist is murdered giving a lecture in front of a packed hall, Cairo's chief of police quickly rounds up those responsible. Or at least some of them. Sir Augustus Wall, antiquities dealer and amateur sleuth, knows there's more to the crime than it seems. With little to go on but an exotic murder weapon, a map of a desert oasis, and some gilded Greek mummies, he sets out across the Sahara with his assistant Moustafa Ghani and the street urchin Faisal, who is the only person to have seen the killer's face. They soon find themselves in the midst of international intrigue on Egypt's remote border with Libya. Can they discover what mystery lies beneath Bahariya Oasis?