From the first page of the PDF:
Following the discovery of corruption among the paladins of the Order of Torm and a deadly plague born of Bhaal that nearly destroyed Scornubel, Everyn Cadwy has brought together the leaders of the various Elturgardan factions for a summit to address the blight at the heart of the region. You have been asked by your allies to help represent one of these factions in order to negotiate the best possible alliance. Your task is nothing more and nothing less than to save Elturgard. A two-round continuous-play Living Forgotten Realms adventure set in Elturgard for characters of the Heroic tier (levels 1-10). This adventure completes the story arc that includes ELTU4-1, ELTU4-2, and ELTU4-3. We recommend that you play all these adventures in order with the same character if possible.