I first read the story THE BEAST MUST DIE is based on, "There Shall Be No Darkness," by James Blish, in ZACHERLEY'S VULTURE STEW, reprinted from a 1950 magazine appearance. Blish tried to give a science fiction rationale to lycanthropy, and there are two werewolves. One of them is a woman. The screenwriters changed it quite a bit. I like the film, though.