Reading The Unforgiven by Gav Thorpe

I'm at page 97 of The Unforgiven by Gav Thorpe.  It's the third book in the Legacy of Caliban Trilogy.  It opened with the surrender of Cypher.  The chapters have skipped around with different battles happening on the planet of Tharsis.  Nurgle plague marines are trying to invade the planet along with Chaos cultists.  I'd like to get further.  But I'm prepared to stop there for now.  I'll write a real review when I finally get done with the book.  That will be sometime in October 2015...