From the introduction: The beloved daughters of Omar-bac-Maheem have been transformed into pigs in a perilous magical accident! This, on the Day of Pigs where hog traders, admirers, and merchants come to trade their beloved porkers. But woe of woes! The celebrations end with a mass feast of pork! The swarthy (some might also add handsome and very comfortably moneyed) merchant has offered the PCs 900 gp for the successful return of his daughters to the very plaza where the foul transformation took place. To make matters more complex, the successful capture of the villainous Mahmud, the half-brother of Omar, is required to replicate the magical accident and hopefully transform the lovely daughters back.