The Princesses of Versailles

Princesses Veronica and Victoria have shared everything. Books, beds, and even the womb. And now that the Franco-Prussian War has broken out, they share their quest for blood. However, many of the Prussians aren't what they seem. The terrifying creatures are anything but human. So now the girls must travel back in time to the French Revolution to unlock the secrets to defeating the wretched things. But will love get in between them and the goal, or more importantly, between the sisters themselves?