Dark Frost was enjoyable. However, I found the mystery far too predictable. For example, I got frustrated with Gwen's blindness about what I thought were really good obvious clues. In addition, I was disappointed with the romance between Gwen and Logan. In general I found the romance a little bland, cliched and anti-climatic. The Snape rip off from Harry Potter was disappointing as well (i.e. Nickamedes). 
 I still love the Mythos Academy world though, and I have high hopes for the next one.