Sombras trágicas ¿vampiros?

I saw this for the first time recently. While this film hasnt aged well n it aint no classic but it shud be definitely viewed by fellas who love mystery films with elements of somnambulism, hypnotism, scientist, bats, vampires, etc.

The producers succeeded in making this film almost as good as any Universal Pictures horror film is because they leased the castoffs, the sets left over from Frankenstein and the The Old Dark House. They even succeeded in hiring actor Dwight Frye (Dwight Frye played Renfield in Dracula and as Fritz in Frankenstein and as a reporter in The Invisible Man). In this movie he gave the same act similar to Dracula, of that a lunatic.

Fellas from a small village start dying under mysterious circumstances n the local doc conclude that the deaths r all the same, blood loss, with two punctures in the neck caused by needle-sharp teeth. The villagers suspect of vampires, but the local cop remains skeptical. Fear of the vampire and suspicion of a local lunatic who is fond of bats quickly spread around the town and people start fearing him.