The Frozen Sewer of Abadar

[Taken from the module] The Sewers of Abadar is an adventure for 3rd Level Characters. While visiting Abadar the party is relaxing at the local inn and the party is approached by the town crier. The city of Abadar is having a problem with the city’s sewers. This adventure was designed to be run in a single session. It’s ideal for a night when the game master may not be fully prepared for their normal campaign, when there are absent players, or as an interlude within a larger campaign. Any city of decent size can be used as a substitute for the city of Abadar.