Once a teenager, Tony Foster helped 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 grown-up Tony makes 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 the life of a vampire detective?Suddenly, the shooting 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 an image of a demon gate on her skin for more than three thousand years. While the door is closed. But the signs foreshadow the calamity. And soon Tony, his vampire friend Henry Fitzroy, the entire crew and Leah herself will be involved in a deadly battle with an unpredictable finale...