On their journey through Persia, the "Empire of the Silver Lion," Kara Ben Nemsi and his loyal companion Hadschi Halef Omar find themselves once again entangled in dangerous situations and mysterious conspiracies. Following their experiences recounted in Karl May's volume 27 "At the Ruins of Babylon," the two wish to continue their search for Dschafar Mirza, the Persian nobleman. However, this proves to be more difficult than anticipated. Upon reaching the plain of Shiraz, they come across the traces of a robbery. It quickly becomes clear that they are once again dealing with the "Sillan" or "Shadows," members of an opaque secret society. The conspiracy reaches the highest circles. But how and why was Dschafar Mirza involved, and what role does the equally beautiful and mysterious Princess Gul-i-Shiras play? An alternative continuation of volume 26 "The Lion of Blood Revenge.".