The concept is loosely inspired by the Slenderman phenomenon and theU.K.
Mary Bellchild killer case, but with its own unique twists.
Its the story of a woman 15 years after she stabbed a classmate, Egerton says.

Netflix
She committed this horrendous act to conjure a phantom called Mercy Black.
And thats what we tried to do.
Mercy Blackis streaming now on Netflix.

Netflix