The Knight and Knave of Swords (Saga of Fafhrd and the Gray Mouser, Bk. 7) in Mass Market Paperback format by Fritz Leiber. Published by Ace in 1990. Available in New condition.
Fritz Reuter Leiber Jr. (December 24, 1910 – September 5, 1992) was an American writer of fantasy, horror, and science fiction. He was also a poet, actor in theater and films, playwright and chess expert. With writers such as Robert E. Howard and Michael Moorcock, Leiber can be regarded as one of the fathers of sword and sorcery fantasy, having coined the term.
**Source**: [Fritz Leiber](https://en.wikipedia.org/wiki/Fritz_Leiber) on Wikipedia.