Reading through the Gaunts Ghosts series has made me want to go and collect the Hardback books.
Penitent (A Bequin Novel)
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If I remember correctly, Bequin was one of Eisenhorn's retinue. I remember enjoying them. Beside, the cover is pretty cool.
I also picked up Sabbat War (Edited by Dan Abnett)
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A series of short stories set within the Sabbat Worlds Crusade and bookended by stories from Dan Abnett, (hopefully stories about the Ghosts.)
Flashman is not a nice person, whereas I always felt Ciaphas Cain was.
I also loved the thought that the terror Cain felt was what he considered cowardice, but to be terrified yet go into battle anyway was the mark of a hero.