The vacation house is a luxurious getaway for a wealthy English family, windows open to sun and the sea, a sparkling swimming pool, and a verdant garden. One hot summer night, while the parents and their friends drink wine and amuse themselves, a young woman--the teenage daughter of the Greek caretaker--ventures for a walk on their private beach. Her life will never be the same again. Ten years later, Julia is the perfect spouse and mother. Slender, blonde, expensively dressed, she's the classic "yummy mummy" of high cook, organizer, arm candy, and speechwriter to her influential husband. But behind her winning smile is a stifled woman trapped in a gilded cage, stricken with anxiety and perfectionism. When Julia meets Laurel, a therapist who promises to help her find fulfillment, Julia opens herself up to the hope of a different future. What happened in Greece all those years ago that binds these two women together? And will uncovering the truth destroy everything... or set them free?