"Fafhrd and the Gray Mouser" is a series of fantasy stories created by authors Fritz Leiber and Harry Fischer. The tales follow two unlikely heroes: Fafhrd, a tall and strong barbarian from Cold Corner, and the Gray Mouser, a cunning and agile thief. Together, they embark on various adventures in the mythical city of Lankhmar and beyond, facing magical creatures, treacherous foes, and moral dilemmas. The stories blend elements of sword and sorcery with humor and camaraderie. First published in the 1930s, they have influenced the fantasy genre significantly, inspiring many writers and games. The duo's dynamic relationship and escapades continue to captivate readers today.