Thanks, Hankir. The last row, representing 25 D and Deathblow, is from the general theme, not the book in the top row. That book's title originates from an earlier, very famous book - and a name in that one is what can be found (remembering 'shattered') in the bottom row, along with another result of the 25 D.
Novalis, have you filled in 1 A? That would give you a big help for finding the authour who used the theme. (And if you haven't yet filled in 1A, looking in that area should help!
Thank you Neveracrossword. I can see 11 possibilities for 1 across assuming I have the right first letter and 2 for 6 across. Even with 2 lists of authors in front of me and your guidance on where to look I am at a complete loss. I can see what is happening in the bottom row but the first part is a complete mystery. The pain from a stress fracture in my leg isn't helping me to think clearly.