A honeymooning couple, Gerald and Marianne Harcourt, travels through the Bavarian countryside when their car breaks down near a remote village. Stranded and seeking assistance, they encounter Dr. Ravna, the enigmatic leader of a nearby manor. Offering them hospitality, Ravna invites them to a masquerade ball at his estate. As the evening progresses, the couple realizes they are surrounded by strange and unsettling behavior from their hosts and other guests. Despite growing apprehensions, they decide to stay, unaware of the dark intentions lurking behind Ravna's charming facade.

The seemingly idyllic village hides a horrifying secret - Ravna is the head of a vampiric cult that preys on travelers. When Marianne mysteriously disappears, Gerald desperately seeks help from Professor Zimmer, a local occult expert with personal motives against Ravna. Together, they uncover the terrifying truth about the cult and devise a daring plan to rescue Marianne before she is lost to the vampires forever. Gerald's resolve is tested as he faces supernatural forces and human treachery to save his wife from an ominous fate.