Swords of the Undercity (1985)

From the back cover: Lankhmar...city of theives, city of the night, city of adventure. Once again, a dark bargain has been struck, and a murder committed in a dark and narrow street. An ancient book, an expedition through the Sinking Lands, and a strange treasure brought back to the city were enough to trigger the envy of the rich and powerful.

Where the path of adventure meets terrible creatures of the night and envy of so many, will you be able to survive the tricks and dangers of ancient Lankhmar? Use your wits and ingenuity and perhaps with some luck your success might overshadow the might of the city's two fabled heroes, Fafhrd and the Gray Mouser.

In addition to the book, the module includes an unattached foldout cover containing tables, NPC descriptions, and a map for player use.