Having witnessed the terrible massacre of Imperial forces on Isstvan III, Death Guard Captain Garro seizes a ship and sets a course for Terra to warn the Emperor of Horus's treachery. But when the fleeing Eisenstein is damaged by enemy fire, it becomes stranded in the warp - the realm of the Dark Powers. Can Garro and his men survive the depredations of Chaos and get his warning to the Emperor before Horus's plans reach fruition?

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Not only does this novel continue the story from the epic opening trilogy, it introduces one of the key figures of the series to come: Nathaniel Garro. His destiny might be murky (and clad in grey), but for now he's a simple Death Guard captain. Find out what drove him from his Legion. Also, Rogal Dorn finds out about Horus' treachery. Spoiler: he's not happy.

The eBook edition includes integrated illustrations of characters and events from the story, and an afterword that places the story in context within the series.