When Greta Helsing, doctor to the undead, is called to Paris to present at a medical conference, she expects nothing more exciting than professional discourse on zombie reconstructive surgery.

Unfortunately for Greta, Paris happens to be infested with a coven of vampires - and not the civilised kind. If she hopes to survive, Greta must navigate the maze of ancient catacombs beneath the streets, where there is more to find than simply dead men's bones.