Oh. Oh. Oh. This book is so heart-wrenching, but not in a "Marley and Me" sort of way. No, this book is heart-wrenching because of Joe Abercrombie's brilliantly designed characters. 
 Abercrombie spent two books building up to Last Argument of Kings, and he does not disappoint. I expected this book to be the neat little finishing touch on Abercrombie's wonderful trilogy, but (if you've read Joe Abercrombie before I doubt this will surprise you) it does everything except tie things up neatly. And that's a compliment. The book has an ending, and the ending fits perfectly with the books, but it doesn't end "neatly." 
 I would explain myself, but I'd give it away. You'll just have to read it. Trust me, its worth it.