After the betrayal of Primark Horus became obvious, the only target of the few who survived and remained faithful to the oath and duty of a citizen of the Imperium was Terra. The frigate Eisenstein, under the command of Death Guard Captain Nathaniel Garro, breaks through to the cradle of humanity to bring to the Emperor's attention the news of the crime committed in the Isstvan system, where hundreds of thousands of the best warriors of Humanity laid down their lives, sacrificed to the insatiable gods of Chaos. The Eisenstein's flight will be long and difficult, but it will be even more difficult to convince the rulers of Terra of the impossible - of Horus' betrayal.