This review was first posted at http://rubysreads.com. 
 I first discovered the Mythos Academy series when I was doing research for an event I was hosting (Private School Paranormals Week). PSP Week was the first event I ever planned and, therefore, this series holds a special place in my heart. That's probably why I expect a lot from it. Well, that, and the fact that I loved the first installment, Luckily for me, book three brings back the elements I loved from Touch of Frost, and takes the action forward in a delightful way. 
 One of my main concerns for this series was the will they/won't they nature of Gwen and Logan's relationship, in that there's a fine line between slow-burn romance and contrivance. In book two, Estep edged over that line. In Dark Frost, she did it again. Just when I was about to groan and consign the couple to the land of Bones and Booth, Estep allowed the characters a chance to talk things out and agree to move forward rather than stagnate. I could've kissed her for that. 
 World-building is also one of Jennifer Estep's primary talents as a writer, and Dark Frost doesn't disappoint on this front, either. I love the way she weaves the different mythologies, integrating them into character, plot, setting and backstory. Gwen continued to be the perfect conduit for us as we discovered more about her world. She learned with us, which meant that things get explained without a lot of clunky exposition. I have an unexplained affection for Valkyries, so I was particularly glad to learn more about Gwen's best friend, Daphne, and her powers. 
 Finally, though, while book three did advance everything in terms of the overarching plot of the series, the one specific to Dark Frost fell flat. The villain was easy to spot, and reminded me far too much of the baddies in the other books. I don't know how many books Estep has planned for this series, but I hope she brings a fresh storyline into the Mythos Academy world soon. I definitely want to make it to the end of the series!