GMA2: They Devour (1e/OSR/OSRIC)

From publisher blurb: Written for 1st Edition, 2nd Edition and OSRIC, this epic quest continues and compliments GMA1: Cult of The Rat God. An ancient evil and its zombie horde attacks the city of Genepa. Hundreds fall and the survivors retreat behind her walls. In their distress, the city council summon the heroes and charges them with a desperate mission to recover the Book of The Unholy. With it, the Temple of Azrael hopes to learn how to disperse the undead which are acting with unusual cohesiveness and cunning. The party must locate the fabled Temple of Corruption and bring the book back to Genepa before the city gates fail and the zombie horde forces its way in. You must hurry! Time is short.