Based on Elena Ferrante's hit novel, "The Lost Daughter" will follow Leda (Olivia Colman), an elegant college professor on a seaside summer vacation, who becomes consumed by Nina (Dakota Johnson) and her young daughter, as she watches them on the beach. Unnerved by their compelling relationship, and their raucous and menacing extended family, she becomes overwhelmed by her own memories of the terror, confusion and intensity of early motherhood.