After her difficult confrontation against the demonic entity Zozo, private investigator Sam Hain travels to Austria to spend Christmas with her friend and former lover, the vampire Countess Carmilla Karnstein. ​ ​

When a string of vampiric murders and the arrival of an unfriendly figure from Carmilla's past threaten their peaceful holiday, Sam finds herself torn between love and duty as she contends with the rage of vengeful ghosts.