Octavia Spencer plays a different type of role in “Ma”. She is an off kilter veterinarian assistant who befriends a bunch of high school kids by buying them booze. She then offers her basement as a place for them to party. Her motives are somewhat darker and relate to her high school years. Spencer is good as always. This film unites her with her director from “The Help”, Tate Taylor. Not a bad mystery, horror film.