Tallarn: Siren is the twenty-eighth short story published in the Horus Heresy Series that was not originally part of a collected anthology. Tallarn: Siren was first published as an e-book.
In the immediate aftermath of the Iron Warriors' attack, the Loyalist forces on Tallarn mount a desperate mission to locate the last surviving Astropath on the planet, so that they can send a distress call to the rest of the Imperium.
The following is the chronological order of the Tallarn Series story arc set within the Horus Heresy:
- Black Oculus
- Tallarn: Siren
- Tallarn: Executioner
- Tallarn: Ironclad
- The Eagle's Talon
- Iron Corpses
- Tallarn: Witness
The Tallarn Series begins shortly after book twenty-three, Angel Exterminatus.
- Tallarn: Siren (Short Story) by John French