Butcher job on Agatha Christie story and a lackluster cast make this nearly unwatchable. The period detail also seems wrong with all that late 1960s clothes and hair.
Rufus Sewell and Rita Tushingham are the only recognizable stars in this mess. Most of the others should have stayed in acting classes a little longer. Especially awful is the woman paying Hermia.
Casting is suspect also in having Sewell married to a Black woman in 1960 London, let along a Black witch living with two white women in Much Deeping.
The whole witchy woman thing vs the usual Christie poisoning plot turns into a total muddle and makes the un-Christie ending really stupid. Oh yes, and cut the F bombs. They added absolutely nothing to the proceedings.
I did, however, like the car Sewell drives.