The newly formed House of Styx is working carefully to set up a base on the surface of Venus, something never attempted before because of the dangers... but they've got a prize nobody else knows about, a wormhole to another star system entirely. However, the government of Venus, and the Bank it's indebted to, has started to clue in on their operations, if not the exact prize, and wants to seize it and send a message by punishing the family's theft of resources from the community. Meanwhile, the family has its own set of social problems, from long-standing resentments and recriminations over deaths, to the romantic troubles of Pascale, who's first love is perfect except for the one secret that may tear them apart... that Gabriel-Antoine doesn't see who she really is.
The first book wowed with the well-thought out look about what living in the atmosphere of Venus might look like, the extreme precautions needed and the dangers of getting it wrong, combined with both personal family drama and the wonder of a portal to the stars. And, occasionally, it tore the heart out with sudden deaths of major characters. Well, be warned, there's more of that in this, it's not a happy story, it's a tale of a struggle in an inhospitable environment against the bank and government beholden to them. Even without people being mustache-twirling villains (and, although there certainly are some evil people, a big chunk of the antagonists are just ordinary people trying to do the best they can in a unfortunate system, and probably think of themselves as being in the right), it's fundamentally a story of a small group rebelling against an established government, and some of those people are going to get stomped on. And, if you're aware of the established lore in the universe (this is the second part of a duology set in the past of a larger space opera series) you know it's got to come out a certain way, so the story has to pay that off. That means that this story necessarily has to involve or at least be the start of a major change in society.
That was fairly well-handled, as it went, although part of me wishes it went a slightly different way, because although I enjoy the storylines involving the political upheaval, for me, the major source of the sense of wonder of the duology was the idea of a small group of Venusian settlers discovering a wormhole and how they investigate and exploit that resource, how that turns the planet from a marginal existence to one of the power players of human society, and how the discovery changes human civilization as a whole. And certainly, there's some of that in here, but only the early stages, and once the conflict between the House and the Government really kicks off, it's shoved into the background and never really regains the focus, it's left to the readers imagination... and to a certain degree, for good reason, because you can't really do the kind of scientific exploration during a crisis like that, and once it's over one of the major sources of conflict in the book is over, so it's probably right to end it... but still, I wanted it, I wanted a hundred more pages of them just peaceably exploring the wormhole and finding out cool things about it. I'm probably weird, but for me it's what would have been a delicious sauce on top of everything that I could dip my bread into, and, instead, there was just enough for the main course (and maybe not even enough to really enhance every bite of that for me).
Still, that minor disappointment aside, this book was a lot of fun (in the way a book where characters you love might die tragically can be fun), and kept up the standards of the other books in this universe well. I may not have liked it quite as much as the others, just because of that hope for more focus on the parts I was really interested, but it's not enough to really quibble, and even a "not as good as previous ones" book is still good enough to cement the author as one of my favorite modern SF authors. Easy four stars.