The Reptile (1966)

Harry and Valerie Spalding arrive in the remote Cornish village to an unwelcoming and suspicious population. Harry's brother dies suddenly, bitten by a lethal reptilian bite. They befriend a young woman Anna whose tyrannical father controls her life and, as they discover that others in the village have suffered a similar fate, their investigations lead to Anna. What they uncover is a victim of the most terrifying legacy... a destiny of mutilation and murder.