The Grey Knights Omnibus by Ben Counter is a first edition science fiction novel set in the Warhammer 40,000 universe. This omnibus includes the first three books in the Grey Knights series, following the story of the legendary Space Marines known as the Grey Knights. Written in English and published in the United Kingdom, this omnibus is a must-have for fans of Warhammer 40,000 looking to delve into the world of epic battles and heroics in a fictional universe.