Leonora Johnson (Barbara Shelley) is led to believe that she has inherited the family curse which will cause her to be psychically linked to a leopard.
While the leopard is real enough, the movie explores whether the curse may only exist in Leonora's mind.
Although this AIP clone of Val Lewton's "Cat People" (1942) isn't very good, at least it's only just over an hour long.
Near the end, Dorothy Marlowe (Kay Callard) passes a domestic black cat on the way to meet her husband at the corner of Denmark Street in London.
The lurid poster misleadingly features a panther.