The Horus Heresy: Volume One

The greatest war in the history of mankind begins. The Emperor's chosen son Horus, recently honoured with the title of Warmaster, is corrupted by the forces of Chaos. Spreading dissent among his primarch brothers, Horus throws the Space Marine Legions into battle against one another in the distant Isstvan System, as he prepares to march on Terra itself... Read it because The greatest story in the galaxy begins here! Horus' tragic fall to Chaos and betrayal of the Emperor are recounted in the excellent Horus Rising, False Gods, and Galaxy in Flames. Flight of the Eisenstein brings us a little hope, while Fulgrim tells the story of the titular primarch's corruption through personal failing. Volume One is a great way to get your teeth into treachery.