I loved the book but I specially wanted to thank you for creating awesome female characters. Gwen, Bridget and Folly are great and Cavendish is a scary villain. The only character I don't like is Ransom. The "evil ex-wife" it a tiresome plot and even when she tried to save Grimm, she fired over the other ships and the shipyard and she caused many, many deaths. So she really deserved something worse than what she got.
I love the humanity in Gwen, Bridget and Folly, they are very different women. And even when Gwen, the petite trigger-happy girl has some reminiscences of Murphy, she never annoyed me as much as Murph in Storm Front and other books. I think Gwen is actually my favorite character (it's difficult, I love most of the characters)
Oh, and Jim, thank you for allowing a balance, the girls are not always the ones in danger, sometimes they are the ones who rescue their male friends. And sometimes, they are rescued by them too. And that is fair. Grimm, Benedict and Master Ferus are awesome too. I also love Bayard, Kettle, Journeyman, even Creedy. And the Spirearch! And I can respect Spira as a foe.