Over the past four days or so I have purchased and devoured the Black Library novel: Helsreach. I thouroughly enjoyed it (though there were a few parts that I didn't like and one habit of the author's style that should have been fixed) and recommend it completely to anyone who is a fan of the Black Templars.
The action didn't get repetetive, the characters were believable (well, as believable as towering Astartes could be), it was discriptive, a very good read. I especially liked Grimaldus's first speech.
That is all.