From the back of the book:
Into the Darkness follows the characters as they seek to return Kammerath to its rightful owner and have it reconsecrated after the Gadianti, worshippers of dark gods and practitioners of even darker rites, have defiled it.
Can the characters return the sword to Nicanor? Can they convince the Gnolaum of their need? And what ties do the Hearthom have to all that is going on? Murder, mayhem and mystery hound the characters as they travel from the forests of the Arak to the blood stained cities of the Gadianti and Zeredites.
Into the Darkness is part two of the sweeping and epic campaign "Unto this End". It is designed for a group of 4th-6th level characters and takes place just days after In the Beginning (found in the Diomin worldbook).