Once a teenager, Tony Foster helped the vampire Henry Fitzroy, the illegitimate son of King Henry VIII, in solving crimes committed by all kinds of undead: demons, werewolves, mummies and zombies. Now, the matured Tony is making a career in television, participating in the filming of the crime series " Darkest Night" as an assistant director. But really, who better than Tony can know the hardships of life as a vampire detective? Suddenly, the filming of the series begins to unfold according to an unforeseen scenario. It is inscribed with magical signs on the human body. A girl named Leah has been wearing the image of a demonic gate on her skin for more than three thousand years. While the gates are closed. But the signs foretell trouble. And soon Tony, his vampire friend Henry Fitzroy, the entire film crew and Leah herself will be involved in a mortal battle with an unpredictable ending...