Wonderblood by Julia Whicker
In the city of Cape Canaveral, the royal establishment is steeped in excess, and science has been corrupted into a blood-soaked religion. When an outcast girl is captured by a self-styled prophet and warlord, she is thrust into his violent designs on the throne. As war nears, Aurora must decide, is she willing to become her captor's queen? And just how far will she go to protect herself? Then two strange lights appear in the sky. Have the shuttles of their forebears returned, or have their beliefs led them all to ruin?