Galaxy In Flames is a novel by Ben Counter and a third book in the Horus Heresy Series. The third installment of the trilogy showing Horus’s fall to Chaos, focuses on the tragic events on Isstvan III, where the loyalist factions of the Traitor Legions were slaughtered with the use of Virus Bombs deployed by Horus’s fleet. It is the announcement to the galaxy of the fall of Horus and the beginning of the Horus Heresy.
The novel was first published in October 2006. Each print run has a different colour for the titles: First was gold, second in silver and third in bronze. It was later included in “The Novels: Volume 1” eBook collection, and it was included as part of the Crusade’s End omnibus, released in paperback on March 8, 2016.