Johnnype
Johnnype asked James Swallow:

The Horus Heresy is quickly becoming unmanageable from a readers perspective. So many characters, so many events, so many factions and players. It's almost impossible to simply know what to read next, especially with all the short stories, novellas and audiobooks tagged on. Is it something the authors discuss and do you have any suggestions on keeping it all straight?

James Swallow I wouldn't agree that it's "unmanagable" - certainly there's a lot of stuff, but that's a function of the demand for new material from readers.
As with any big series, I think it's best to first read the bits that interest you the most and tackle the other stuff as and when you want to.
Also, I think it's important to note that the short stories, novellas and audios are not just "tagged on" - each story we write builds the larger tapestry of the Horus Heresy plotline in its own way.
Certainly, the scope of the series is something the writers and editors discuss and manage internally, to keep things consistant as we move toward the Siege of Terra and the saga's end.

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