Rumor has it that within the gloomy grounds of the infamous Thorneburg Castle lurk bloodthirsty vampires responsible for the disappearances of hundreds of locals in the bleak, remote countryside in Central Europe of early 19th century. Christopher Hart, a 19-year-old village boy, who has always dreamed of traveling and writing books, leaves his poverty-ridden family to find a job. But when no one wants to hire him because of his physical weakness and clumsiness, he joins a shady hunting group obsessed with the supernatural out of desperation. Christopher's innocent appearance is perfect for their next mission targeting the Thorneburg Castle. Christopher will pose as a servant for the aristocratic family, the Waltons, while investigating the truth behind the alleged atrocities to help the group kill the Waltons and end their string of horrific acts once and for all. Herbert Walton, a 25-year-old hopeless romantic who loathes everything about being a vampire, is the laughing stock of his entire race for his gentle nature and panic attacks. Living in Thorneburg Castle alongside his parents, he spends his days feeling caged, lonely and dreaming of seeing the human world he has always been curious about. But when Christopher arrives, Herbert becomes infatuated and spends each day trying to prove he is not the murderous monster the rumors say he is. As Christopher is whisked into the Waltons' glittering world and Herbert's unexpected sensitive nature gradually wins his heart, he becomes torn between his mission and his growing affection, and is faced with two uncomfortable revelations: the Waltons want him to become one of them, and he might be in love with the very monster he was sent to destroy.