Resource Mercy Black posted on August 26, 2021 in: Watched Film and TV, Film, Horror, Mystery and Thriller. — Rating: ★★★½ — TMDB link Metadata Overview A woman is sent to a mental institution after stabbing her classmate in an attempt to conjure an evil spirit called, Mercy Black. Fifteen years later she's released, and must save her nephew, who has become obsessed with the phenomenon.