This is another in the Universal series of Dracula horror features. It’s a good entry of its type.
Plot, in detailing the legendary transformation of humans to vampire form at night through throat-bites by a previous victim, ships Dracula’s son (Lon Chaney) to a small town where Louise Allbritton is an occult follower. There’s the usual lonely manse with surrounding woods; and killings by the night-flying vampire to arouse the countryside.
Allbritton marries Chaney, whom she believes to be a Hungarian count, and comes under his influence. Her affianced (Robert Paige) figures strange things going on, and compares notes with town doctor, Frank Craven, and psychologist J. Edward Bromberg.