British scholar Frank Carew is in Wallachia to study the magic generator on nobleman Radu Vacarescu’s land. There, his party is attacked by bandits and his friends are killed. Pursued by a vampiric figure, he flees to Radu’s castle for help. Unfortunately, this is precisely where the vampires came from. If allowed, they would feed unchecked and spread their undeath across the whole Earth, but Radu maintains a shaky control over them and keeps them penned in his tiny corner of the country. As Frank recovers from his assault, Radu finds himself falling for the young man. But loving Frank and not wanting to lose him leaves Radu vulnerable to his demons’ demands. Can he bear to let them feed on the man he loves? Or must he give in to their blackmail and set them free to feast on his entire country?

Wallachian nobleman Radu is recently arrived in Bucharest with his vampire parents. Welcomed as an eligible bachelor, he’s introduced to the enchantress Ecaterina, whose salon is Bucharest’s centre of magical expertise. But when Ecaterina’s brother dies of a mysterious new plague, it’s clear to Radu that his parents have not been idle. Soon Bucharest is in the grip of an undead epidemic—a less than ideal time for Ottoman Sultan Mahmud, Wallachia’s overlord, to call Bucharest’s nobility to assemble their armies in Istanbul for a holy war against Britain. The Wallachians have long resented their Ottoman overlords, so Radu seizes the chance to eliminate them while also ridding Bucharest of the undead: he leads an army of vampires to Istanbul and sets them to feed on the Turks. As Radu’s demons gut the city of Istanbul, their plans become horribly clear. This is only the start. With the Ottoman armies under their control, the undead are poised to suck the life out of the whole world. Radu, his lover Frank, and Ecaterina are appalled at what they’ve unleashed. But they may be too late to stop it.