"Pax Aeterna" tells the story of a secret vampire society. In the course of centuries, it separated into three different parties, which maintain a delicate peace. Eventually, in current Cologne, masked assassins attack the parties and provoke violence and distrust among them. They try to stop the assassins, but their own prejudices against each other and their lust for power turn out to be great obstacles on the way to the truth. We meet the night with young Anna. Her rebirth as a vampire raises questions and bears a secret, which may be related to the mysterious assassins.