Miles, Mutants and Microbes

This was ...okay, I guess? Enjoyable, but definitely the weakest point of the series.
The first book, Falling Free, had some interesting ideas, but suffered from a very sudden ending and a cartoonishly evil villain.
The other half, Diplomatic Immunity, was nice because it gave us a chance to revisit with Bel Thorne, who I'd always been fond of. I found the “mystery” rather telegraphed, though, and had hoped Ekaterin would have been in it more (I love her and Miles' banter).