From the back of the book:
Kha 'Hamet, the demi-god, loved the mortal As' Wan like no other. After she was slain, Kha 'Hamet could not finish the funerary ritual and so, left her unburied and she was denied her afterlife. Kha 'Hamet cheated Osiris of his bounty and in a rage, Osiris plagued the land of As' Wan and all her people. Osiris unleashed a beast upon them, and all was laid waste. Though the memory of men is short, the gods do not forget, and Osiris bid the beast return every 250 years to hound As' Wan and Kha 'Hamet's children and all their descendants.
And so it has been for ages.
The beats has returned, hunting the people, hounding them, and slaying the unwary. All have fled to town of Paros, fearing Osiris' curse and waiting for aid.
This module is designed for 4-5 characters of 7th-8th level. A cleric or similar class is useful for the successful completion of the module.