Dragon Flight by Jessica Day George
I didn't know how Jessica Day George was going to make a sequel to this book, but she did it and she did it brilliantly. The story is just as magical as it is in the first book, and I love the development of old and new characters.
Since the Dragon War, Creel has been busy at her new popular dress shop. But when Luca sends her a message about dragons being controlled in another country, she knows that it is up to her to find out what is going on. Her old friend Shadras is reluctant to get mixed up in human affairs (even when it concerns other dragons), but eventually agrees to help Creel find out what is going on. Creel discovers that someone or something is using necromancy to control the country's dragons. Can Creel find the culprit and put an end to the 2nd dragon war before all those she loves are destroyed?