- Blood Games by Dan Abnett takes place on Terra and involves the Custodes as they guard the Emperor's Palace, and Terra, against traitors.
- Wolf at the Door by Mike Lee deals with the Space Wolves 13th Company as they liberate the Lammas subsector.
- Scions of the Storm by Anthony Reynolds is about the Word Bearers Space Marines.
- The Voice by James Swallow concerns the mysterious Sisters of Silence.
- Call of the Lion by Gav Thorpe loos at the Dark Angels as they explore system DX-619.
- The Last Church by Graham McNeill tells the story of the Church of the Lightning Stone and it's last priest Uriah Olathaine.
- After Desh'ea by Matthew Farrer looks at Kharn of the World Eaters Space Marines.
This is a great collection of stories that further expands events taking place during the Horus Heresy. Well worth reading, especially if you have read any of the other Horus Heresy books.