When Charles takes Anna to meet an old (human) friend of his and buy her a horse for her birthday, he didn't expect to get sucked into the rising war between Fae and human. But the fae have attacked the human members of the Phoenix pack, and Charles always protects his own. Along the way, he and Anna learn about the hearbreak of being friends with humans and the dangers of loving those who will not live forever. 
 The meat of the story was exactly what I expect from Briggs--fast-paced but with time for introspection, carefully constructed characters, and lovely writing. However, the set-up--Anna arguing with Charles about wanting to try to have kids--felt contrived and clunky, especially when she agrees to stop nagging him about it toward the end of the book. Even the writing was odd through that opening section, as if it was a reason to get Charles and Anna moving rather than something Anna would actually want (or, at least, the way she would actually approach it). 
 If this is going to lead into a knock-down, drag-out fight between Fae and human with the werewolves caught in the middle, bring it on. That will be a great series of books to read, not least because it will give the Alpha and Omega books a continuing arc, rather than a monster-of-the-week flavor. 
 (On an almost-completely-unrelated side note, I found it difficult to take the girl named Amethyst very seriously, probably because I remember reading This Present Darkness and Piercing the Darkness as a teenager, and one of them included a "spirit guide"/demon whose name was Amethyst. That's entirely my problem, though.)