The Pyramids of London - Cover reveal and genre questions

I've been looking forward to this cover for quite a while!  Another gorgeous Julie Dillon piece that I'm totally going to have to have as a print on my wall.

In a world where lightning sustained the Roman Empire, and Egypt's vampiric god-kings spread their influence through medicine and good weather, tiny Prytennia's fortunes are rising with the ships that have made her undisputed ruler of the air.

But the peace of recent decades is under threat.  Rome's automaton-driven wealth is waning along with the supply of their power crystals, while Sweden uses fear of Rome to add to her Protectorates.  And Prytennia is under attack from the wind itself.  Relentless daily attacks destroy crops, buildings, and lives, and neither the weather vampires nor Prytennia's Trifold Goddess have been able to find a way to stop them.

With events so grand scouring the horizon, the deaths of Eiliff and Aedric Tenning raise little interest.  The official verdict is accident: two careless automaton crafters, killed by their own construct.

Nothing could convince the Tenning children, or Aedric's sister Arianne, that the deaths were anything but murder.  They will stop at nothing to uncover what really happened.

Not even if, to follow the first clue, Aunt Arianne must sell herself to a vampire.

Here's the full image.  It's my first wrap-around cover (which I wanted because I wanted that sweep of city with the pyramids rising above it).

The genre of this one is going to be super tricky and I imagine a lot of people will pick it up thinking it's one thing and find it's another.  A lot of my books feature both adult and child POV characters, and this is no exception, swapping between Eluned (at the front in the picture) who is fifteen, and Arianne, who is in her thirties.  I don't consider it YA because it doesn't involve moving from childhood to adulthood in any particular way.

It's also not Steampunk, in that it's not a Victorian setting, and does not use Victorian clothing or social mores, but the tech level is similar.  It's both fantasy and science fiction, since the main plot of the series revolves around awakened gods and scientific change.  It is certainly alt-world, in that it started with our world and then had increasing points of divergence - and it's involving such an enormous amount of research, even if all I can research is the starting points before the divergence - so I'm going to think of it as alt world kitchen sink.

The release date will maybe be at the end of this year (all that research is slowing me down, although I'm collecting some lovely books like one which is maps of London through history).  If not this year, then early next year.  It's very hard to tell since I'll be overseas from August - November and expect that will impact my output rather significantly!