If 1989's "Heathers" was more artsy, minimalist and contemporary, you’d get director Cory Finley’s finely tuned "Thoroughbreds." A nasty little piece of business, this film coming to us from Finley, a theater veteran, brings out the best of his two leads, here played by Anya Taylor-Joy, Olivia Cooke and the late Anton Yelchin, as they get themselves involved in a murder plot that is as highly unpredictable as it is stark and pitch black, and I do emphasize the latter as ebonus as they come. It’s a sleek and stylish film that sneaks up under you and hits you like whiplash.