After the double whammy of the last book, Jack is feeling appropriately glum. He's not even taking on new jobs at this point because of his high glum rating. But, of course, someone at the bar makes a special request, and Jack feels sorry for him, and hijinks ensue.
The opening gambit is really just a way for Wilson to introduce the main story here, of course, which involves explaining a lot of the lingering questions that have come up through the first nine books of the series. This is probably our heaviest "mythos"-heavy book since "Conspiracies" (book 3!). We've gotten hints and tastes here and there, but the veil is finally torn off on a lot of things here: the identity of the Twins, their place in things, what was up with that weird scene where Gia was nearly run over, and (I'm sure) countless other things that I missed.
Jack finally finds some people he can really talk to about a lot of the shit going down in his life in the form of the Yeniceri (sp?), kind of ... human super soldiers dedicated to protecting an Oracle. I found this a pretty fascinating new take on things, allowing Jack to interact with people whose knowledge was an imperfect Venn diagram only overlapping some with his own understanding of events and his place in them.
It's difficult to talk about this book without going into major spoiler territory, so I'll keep this vague. This book ALMOST changes the entire dynamic of most Repairman Jack novels in a way that really surprised me. What I found most intriguing is that, rather than being frustrated and angry at that possibility, I found it quite welcome. As much as I love Jack and his supporting cast and the sort of ... almost-"formula" that the books follow, I'm excited to see where things are going, and really want the story engine to change, if possible.
It was all a ruse, of course, but I assume SOME fairly large changes must be on the horizon.