Confession: I was weary approaching this installment (and not as excited) because I really didn't think it was needed. I thought Bloodline had a good closure and I was worried that this would be another series that continued without direction.
Well, this taught me not to doubt Jordan L. Hawk. She definitely has a arc plan for this series. Hoarfrost smartly connecting some clues we've already given from previous books, i.e. Griffin's biological brother, Griffin's horrific experience when he lost his partner, their demon encounters in Egypt, heck even the ramification of Whyborne's cousins appearance ... and the result was another blast of adventure as our beloved team went to Hoarfrost, Alaska, and encountered more than just city under the ice.
It also helped that Whyborne/Griffin was such a darling couple (I adored them, really) and that we FINALLY had Griffin's POV in the novel. I guess now, if I see another book in this series, I will have faith that it will be great :)