from Wiki
Three novellas have been published – The Hedge Knight (1998), The Sworn Sword (2003) and The Mystery Knight (2010) – and Martin has stated his intention to continue the series. A collection of the existing three novellas, with illustrations by Gary Gianni, is set to be published as A Knight of the Seven Kingdoms in October 2015.
I enjoyed reading them, much lighter reading, but enjoyable and gives a good history lesson of Westerose.
Make sure you have a good family tree of the Targarians handy when reading.