It Lurks Below

From the front cover: A mournful girl has begged you for aid. Her father, keeper of the city's vast sewer system, has disappeared. The city guard will do nothing and she suspects foul play or possibly something even more sinister. An adventure is at hand and only one thing is certain, It Lurks Below! It Lurks Below is an adventure for four to eight first level characters using the First Edition game rules.