Chris Wraight’s Brotherhood of the Storm is a Horus Heresy novella which gave us our first proper look at the Heresy-era White Scars. It was originally released as a standalone novella, first a posh limited edition version but now available on the Black Library website in print, ebook and audio formats, but it also comprises the first story within Legacies of Betrayal, the 31st full book in the Horus Heresy series. That does mean that completists may well end up owning it twice, but it also means that fans who don’t want to fork out for the hardback novellas can now get their hands on it in a more palatable format.
