Burn, Witch, Burn is definitely enhanced by a well written screenplay. Richard Matheson [I Am Legend] co-wrote the script based on a novel by Fritz Leiber, Jr. The dialogue is smart and the pacing of the story is perfect. Kudos as well to director Sidney Hayers who captures the tension between the two main actors perfectly. His work here reminds me a bit of Alfred Hitchcock. Finally, the soundtrack is beautifully orchestrated and greatly adds to the feel of the film.
Don't miss this one. It may not be well known but it should be. It's definitely a keeper!
For more info check out the film's entry in IMDB.