A good addition to the series. I enjoyed discovering how Petur and Deyvid got together and liked how it flowed into more current events. I'm hopeful (based on the ending) that we will see more of this trio (please?)
For those who are sensitive to such things, this is mainly MM, with MMM scenarios at the very beginning (includes sex) and end. That being said, this series is, for me, is a rare example of an MMM that I enjoy - 99% of the time MMM gives me the ick.
If you liked the trilogy, highly recommend. If you haven't read the previous books, you could start with this and it would work well, but it's also fine as a post-series standalone.