A plague of rats overrun Lankhmar, the capitol city and glittering gem of the land of Nehwon. Commissioned to guard a ship of grain from the cursed rodents, brother-in-arms Fafhrd and the Gray Mouser soon discover the plague has progressed to a fatal point. Mustering the strength of sorcery, they descend into the depths of Lankhmar and rise to battle in order to save the soul of the ill-fated city.