One day the inevitable happens - in a fit of passion the vampire girl again ceases to control vampire instincts at certain moments and bites her beloved, bringing her irreparable harm. Now Laura begins to experience a constant sense of anxiety and see monstrous nightmares, capable of depriving the mind of any person. The roommates decide to seek the help of fellow specialists working at the University of Silas.
It turns out that a mortal threat looms over mankind. Carmilla, who was recently a well-bred, low-key, friendly girl, turns into a bloodthirsty, uncontrollable beast, lashing out at anyone to meet her fresh blood. To find out the reasons that provoked such behavior, Laura and her friends go to the ancient castle, where secrets from the past brutalized vampire are kept, able to tell how to fix the predicament.