Thoroughbreds [2017] – ★★★1/2 What happens when a street-smart, completely unemotional teen girl rekindles her childhood friendship with a doubtful, book-smart girl who has emotions, but who wants to get rid of one pressing problem in her life? This situation lies at the core of Thoroughbreds. Rising stars Olivia Cooke (The Limehouse Golem (2017)) and…