Basically, it is the XVIIth Century French Kingdom transposed in the future.
The first novel, Vent de Guerre, is about a young noble officer who is allowed to join the Grey Musketeers, on of the elite regiments of the kingdom.
You can see the trailer here :
The book is accessible on lulu.com and amazon.com
It may be available as an ebook real soon on the Apple ibook store.
My website dedicated to this universe is also available here :
The website is currently in French but will be translated in English also soon.