Illmoor Chronicles: The Shadewell Shenanigans by David Lee Stone
Groan Teethgrit and Gordo Goldeaxe have looted one village too many, and now the Lords of Illmoor are baying for their blood. Can Duke Modeset, exiled Lord of Dullitch, devise a plan clever enough to topple the duo AND Groan's equally reckless half-brother? Of course he can't, he's next to useless himself ...
... but he does have one secret weapon: an extremely beautiful princess who seems willing to do absolutely nothing for the good of her country.