The 1959 version of The Bat is the fourth version* of the story, all based on the 1908 novel The Circular Staircase. This played a double bill with the Hammer version of The Mummy.
Agnes Moorehead plays Cornelia Van Gorder, a mystery author who gets involved with a bank president and his physical (Vincent Price) who are trying to scam $1 million dollars ($8.9 million adjusted for inflation) when a forest fire breaks out.
Meanwhile, a giallo-esque masked villain named The Bat is tearing out the tender throats of young women with his steel claws. He learns of the scam and terrorizes an entire house full of women, among them Darla Hood. Yes, the very same Darla from Our Gang in her last role.
Crane Wilbur, who directed this, started his career as an actor. He was also a screenwriter and wrote House of Wax.
*The other versions are the 1926 silent film The Bat, as well as the 1930 movie The Bat Returns and a 1920 stage play.