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.