Mus of Kerbridge

Mus of Kerbridge is a 1995 fantasy novel by Paul Kidd. It follows the story of a mouse called Mus who has been sent to spy on the princess of Kerbridge only to help her fight against the warlady of the South. It is set in the same world detailed in the Lace & Steel RPG.
Background.
"Mus of Kerbridge" was first published in the United States in May 1995 by TSR, Inc. in paperback format. In 2007 it was republished at Lulu. It was a short-list nominee for the 1995 Aurealis Award for best fantasy novel but lost to Garth Nix's "Sabriel".