Warhammer 40k - A Legacy of Caliban Novel - Ravenwing by Gav Thorpe

The Ravenwing stand apart from the rest of the Dark Angels Chapter – these dynamic Space Marines take to the battlefield upon steeds of adamantium and steel, and swoop from the skies in lightning-fast speeders to bring death to the foes of the Imperium. Led by the heroic Master Sammael, they prosecute war where their battle-brothers cannot, and are ever at the forefront of the Dark Angels' campaigns.

When he joins their prestigious ranks, Brother Annael finds himself thrust into a whole new world of shadowy intrigue, and privy to secrets unknown to his common battle-brothers. In the wake of the conflict at Kadillus, hints of a dark conspiracy begin to emerge, and it soon becomes apparent that the Ravenwing has a sacred duty far more vital than hunting down orks...