Swords in the Mist/Swords Against Wizardry Books 3 And 4

Fafhrd and Gray Mouser visit the Witch's Tent to consult a sorceress who holds the secret to their escape-but when would they ever need to escape? Their luck has been good so far; one way out should work. Their luck continues as thieves. They are the best thieves in Lankhmar until better positions arise: The Lords of Quarmall. Gray Mouser and Fafhrd steal a kingdom within a hill and declare themselves Lords.