After a series of murders, a man finds out that his mother was bitten by a vampire bat during her pregnancy, and he believes that he may be the vampire committing the murders.
Paul Kristan
Anders Bizet
Marguerite Mane
David
Zan
Mother Molly
John Mane
Martha Kristan
Kindly old doctor "Prof. Kristen" (Ralph Morgan) finds himself amidst a spate of brutal murders - but it's only when he is told that his pregnant mother was bitten by a bat before he was born, that he considers that he might be the man responsible - especially as he has become prone to blackouts when it gets truly dark. It's a wee bit predictable, but there is enough to keep it interesting with a fun contribution from Mischa Auer as the hunchback and a better than average script that almost evokes a bit of sympathy for the beastie.