Wikipedia:
A Dark Song is a 2016 Irish-British independent horror film, written and directed by Liam Gavin and starring Steve Oram and Catherine Walker. It was released to select theatres and digital streaming platforms on 28 April 2017. It is Gavin’s directorial debut.
This film is British, but I’m not sure I’d call it a horror film, it’s a supernatural film, since the entire plot is a woman convincing a witch to perform a ritual to summon a guardian angel. I would also call it a bit of drama as well given the reasons the woman wants to do the ritual in the first place.
It’s a slow moving movie, the ritual takes quite a few months to perform, and gets awkward, intimate, and exhausting. Eventually the woman has had it, and takes matters into her own hands…and then the movie gets a bit more interesting.