Sister of Silence is the fourth audio drama for the Horus Heresy Series that was not originally released as part of an anthology or other release. Sister of Silence was released by the Black Library on April 1, 2012 and the download was limited to those readers who subscribed to the Black Library's newsletter. Released as an April Fool's joke, after a brief introduction there is nothing but silence that follows for thirteen full minutes.
This audio drama has no official story synopsis, because, of course, it has no story.
- Sister of Silence (Audio Drama) by Edward Knight