Lost Sons is the forth short story published in the Horus Heresy that was not originally part of an anthology novel. It was first published as part of the event exclusive Black Library Weekender Anthology and was later released separately as an e-book. It is also included in The Silent War anthology novel.
The Blood Angels were lured into a trap at Signus Prime by the most vile treachery imaginable, but not all of them went with Sanguinius on that fateful journey. Keeping the home fires burning on Baal, the remaining Honour Guard are brought news of their Primarch's death and must decide upon the final course for their Legion themselves.
- Lost Sons (Short Story) by James Swallow