From the front page of the PDF:
In the human bastion of Almraiven, a gifted magical scholar has gone missing. Agents of the Efreet Lord Memnon are known to be interested in her studies; has she been kidnapped for her knowledge, or is something more subtle afoot? A Living Forgotten Realms adventure set in Calimshan for characters of the Paragon tier (levels 11-20).
Note: This adventure takes place prior to the events chronicled in the first three Year 3 Calimshan Story Adventures, and is a stand-alone story. There is no connection between this adventure and CALI3-1 through CALI3-3, so players need not make any special effort to play this adventure with the same character who plays the other Calimshan adventures.