I stopped this film 20 minutes in to look up the Scottish ballad the film was based on, "Ballad of Tam Lin", so I could make sense out of the film. Wikipedia has a thorough article on the song and the lyrics. Everything made much more sense after reading the article.

That said, this was one of Ava Gardner's few supernatural films, and was Roddy McDowell's only directorial effort. The screenplay sticks fairly close to the song's plot, with a look at "Swinging London" mod clothes, late 60's slang , and a so-so song overlaying all as an attempt at "relevance". Listen for the bits of ballad sung through the film .

Gardner gave an outstanding performance as the coven leader; the film lets the viewer decide if other fairy tale terms are applicable. Ian McShane is good as the Favored One, and Stephanie Beacham is good as his Human love.

AIP gave the film only a limited release. The misunderstanding arises from the fact that AIP promoted it as a horror film rather than as a poetic romance even reediting the film and retitiling it "The Devil's Widow" from the original "Ballad of Tam Lin" to try and achieve this effect. As a result, no one was happy, and the film sank without a trace, predictably losing money.

McDowell didn't direct another film, which is a real shame, because this one has startling photography, the music is interwoven to maximum effect, and McDowell did well by the actors.

This is one of Ava Gardner's least-seen, most underrated films. My opinion is that if you feel lost in the beginning, stay with the film anyways as it improves as it goes on.