Kingdom of the Silver Lion

Kara Ben-Nemsi, friends and rescuees set out to free a young relative of the guardian of the treasure of the Chaldaeans 'Christian sect), who is captured for that fabulous ransom. They discover the machradsh of Mossul isn't dead. Indeed he teamed up with local gangster leader Abu Saif, focusing on revenge viz. the gold. The governor even maneuvers to be reinstated and have Kara declared wanted by the padishah. Kara manages to undo all that and save the Chaldaean treasure.