GMA1: Cult of The Rat God (5E)

From publisher blurb:

The party arrives in the City of Genepa, a thriving port and trade town. While they explore the city and seek adventure, their inquiries lead them to a troll and reptile infested swamp in search of an elusive group of slavers that are reputed to be lead by a wererat bandit and his wife. The Rat King and The Rat Queen. White that is happening, a necromancer is busy, secretely plying his trade in or about the Ratmire District and the Planned Afterlife Cemetery. As undead start to rampage throught sections of the city each night, the council summons the players and other groups to investigate the cause of the discturbances. This leads the players down a perilous path of uncovering the Cult of The Rat God!