Cry of the Werewolf

Cry of the Werewolf, also known as Daughter of the Werewolf, is a 1944 film starring Nina Foch, based on a story by Griffin Jay and directed by Henry Levin. A Romany princess descended from Marie LaTour has the ability to change into a wolf at will, just like her late mother. When she learns that Marie LaTour's tomb has been discovered, she decides to use her talent to kill everyone who knows the location, because it is a sacred secret that only her people are allowed to know. This is often cited as the first film to have a female werewolf in it, but an early short silent called The Werewolf (which is indeed the first werewolf film ever made) used that plot device first, in 1913. Unfortunately this film is now lost.