“Mercy Black” (*1/2 out of four) was a ponderous horror movie about a young girl (Daniella PIneda) who is returning home after 15 years from a psychiatric facility after stabbing a classmate and attempting to conjure the title spirit but upon returning home, she finds the spirit is very much alive and well and wants to kill her once and for all. Good atmosphere is just about all this thriller has going out for it, as story goes nowhere and takes its slow time getting there. Janeane Garaofalo is wasted in a minor role as a doctor at the facility