 They are the most dangerous supernatural creatures on earth. They are immortal, insatiable, ingenious, and irresistible. For centuries, a single force has kept mankind safe from their domination: the light of the sun. Until now...A team of scientists has created the ultimate weapon, one that could trigger a nuclear winter of eternal night. To gain control of this weapon, a master vampire, Gallow, will send his vampire mistresses to seduce the scientists and make them his undead slaves. The vampires  only obstacle: SHADO agents Don Cooper and Paula Ross. But Cooper also has one weakness: his lovely wife, Lily. When Lily becomes one of Gallow s minions, he commands her to destroy Don and Paula and help bring about the vampire vision of eternal night...