It's some years after the Heralds of Valdemar trilogy, and major events (Winds of Fate trilogy; Mage Storms trilogy) have wrought major changes in Valdemar. These changes include, but are not limited to, the return of magical, intelligent creatures long absent, and long suspected to be entirely mythical.
These include, most notably for this book, gryphons. And specifically, Kelvren, a wingleader of the Silver Gryphons, part of the k'Valdemar Vale, which is allied with but not part of Valdemar. After intervening to help Valdemaran troops in a battle against merchants motivated solely by greed to secede from Valdemar and stop paying taxes (it's more complicated, of course, but that's the basis of it), Kelvren is very badly wounded. Since this is a Valdemaran troop far from k'Valdemar, and somewhat undersupplied because of the many challenges the kingdom is facing, there's only a "herb and knife" Healer, who does his best, but is not trained at all in caring for gryphons. Kelvren, like his Valdemaran tentmate, Hallock Stavern, Second of the Sixteenth, is unlikely to survive.