On Terra, the last Imperial Fist fights to unite the squabbling High Lords in defence of the Imperium, even as treachery rears its head within the Adeptus Mechanicus. And far away, the Fists Examplar find an unexpected ally for a most dangerous mission… Paralysed by the continued ork invasion of Imperial space, the rulers of Terra continue to fight among themselves. Finally losing patience with the High Council, Koorland – the last surviving Imperial Fist – ousts the Lord Commander and seizes control. Elsewhere, the Fists Exemplar are forced by circumstance to fight alongside the Iron Warriors. Where will such an alliance lead – can a Traitor Legion ever be trusted? It's a turning point, in more ways than one, and introduces not only a potential solution to the ork problem the Imperium's experiencing, but a major new threat that they'll need to deal with as well...