Scions of Adartu: Swords and Secrets in Dipur~

From the introduction:

The characters are caught up in a plot to oust the Khazistani rulers from the city of Dipur. The plotters are the 'Scions of Adartu', a clandestine group who work towards the return of an exiled a Royal family. First, the characters must enter the deserted tower of a Sorceror and then infiltrate the catacombs of the long abandoned temple of Baal Khardah to retrieve an ancient scroll.The situation becomes somewhat more complicated when the 'Kardeslik', agents of the Khazistani rulers, become involved. There are several characters and locations referred to in the adventure whose descriptions and statistics can be found in The City of Dipur - Gateway to the East and The Shadow of the Ragged King.