I have been waiting for the sequel to Winter Fire since I finished, and Hailstorm was well worth the wait.
Sequels don't usually compare to the first book in a series, but Hailstorm makes the transition beautifully with breathetaking scenes, dynamic characters, and writing that once again surpasses the average Young Adult novel. The story-line of Hailstorm follows close after Winter Fire's end, and manages to not only keep the story going and growing, but also to gracefully add new plots to the action and deeper insights into your favorite characters.
Hailstorm is a fantastic read, and a fantastic addition to the Winter Fire series. Highly recommended.
(reviewed the day of purchase)