The corrupt Lord Ambrose D’Arcy steals the life’s work of the poor musical Professor Petry. In an attempt to stop the printing of music with D’Arcy’s name on it, Petry breaks into the printing office and accidentally starts a fire, leaving him severely disfigured. Years later, Petry returns to terrorize a London opera house that is about to perform one of his stolen operas.

Honeymooning in Bavaria, the young couple become stranded and are forced to stay the night in the area. Doctor Ravna, owner of the impressive chateau that sits imposingly above the village, invites them to dinner that evening. Their association with Ravna and his charming, beautiful family is to prove disastrous as they become unwittingly embroiled with this family of vampires who seek to initiate them into their diabolical creed.