This is a modern version of the old story " The Devil and Daniel Webster". In brief, Jabez Stone is a struggling writer ( instead of farmer ) and the devil comes disguised as a crafty, ruthless female, but the basic elements are all there----in addition to some new ones that depict, quite compellingly, how making a deal with the devil undermined his conscience and turned him into a person he never wanted to be.
Just as in the original story, Daniel Webster takes his case, at enormous risk, in order to redeem Jabez Stone's soul. Minor details have been changed, but they really serve to enhance the story, so the plot is a real winner.
It does not come from a big studio, unfortunately, but the performances are excellent and totally befitting of a more expensive movie.
The allure of temptation and the unexpected consequences of self-serving priorities are on full display here, and make a vivid, enduring impression.