Watch Mercy Black (2019) HD Full Movie Free on SolarMovie. Watch Mercy Black (2019) online free. A woman is sent to a mental institution after stabbing her classmate in an attempt to conjure an evi...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.