Warhammer 40k - Yarrick: The Gallows Saint by David Annandale

Fresh from his victory against traitors on Mistral, Commissar Yarrick deploys to Abydos to watch a great triumph in honour of the forces who liberated the world from the grip of the alien tau. But when the planet’s governor is assassinated, Yarrick is drawn into a political game with deadly consequences for himself, his Steel Legion troops and Abydos itself. Can he unravel the mystery and reveal the true traitors on the world before it is too late?