I'm so not a series reader. Exceptions prove the rule, though, and this series is one of them. A different pairing in each book, this time it's Beckett and Kayden's turn. Kayden, who featured before only as Sanctuary's slightly freaky doctor and Beckett, former Sanctuary Project. The pattern is similar in each book, and yet they aren't formulaic. The overall case connecting the books is continued here in an interesting, engagaing way; mystery-wise, I thought this part the best. It's best to read the whole series in order for full enjoyment!