The Guardian has called The Girlfriend a “sexy and Oedipal thriller.” The premise pushes one concept to the extreme: What happens when your mother and your girlfriend can’t stand each other? The triangle consists of Cherry (Olivia Cooke), the new girlfriend of Daniel (Laurie Davidson), a successful surgeon whose mother is the formidable Laura (Robin Wright). How far will each go to protect what they love? Across its six episodes, this adaptation of Michelle Frances’s novel—by Gabbie Asher and Naomi Sheldon—returns time and again to that central question, with just the right amount of angst. —Elena Clavarino