In the heart of Transylvania, Michelle, Mara, and Lillian, three American college students, arrive in the small, picturesque Romanian town of Prejmer to study local folklore. Unknowingly, they enter a world of ancient darkness when they become entangled with the vampire Radu, an immortal being who has recently returned to reclaim his family's castle and the powerful Bloodstone, which grants immortality to those who possess it. Radu, driven by a vehement hatred towards his brother Stefan, a more benevolent vampire, seeks to destroy him and assert his dominance. The three women, unaware of the looming danger, find themselves caught in a deadly struggle for power.

Radu's malevolent nature is evident as he unleashes his army of subspecies creatures to do his bidding, capturing the women and subjecting them to his sinister will. As the town's dark history unravels, Michelle, Mara, and Lillian are forced into a desperate fight for survival, facing horrors they had only read about in old legends. With the Bloodstone's enchantment intensifying the stakes, they must navigate the treacherous web spun by Radu, who will stop at nothing to achieve his goals, while Stefan tries to rescue them and protect the town from his brother's tyranny.