The year is 1977. Phoebe O'Connor (Jordana Brewster) lives in San Francisco with her mother. She has just graduated from high school and is enrolled to start university in the fall. But Phoebe feels disconnected from the world around her, and is increasingly obsessed with the memory of her sister Faith (Cameron Diaz), who killed herself in Portugal six years earlier. Faith was a charismatic and beautiful creature, everyone's favourite - and the circumstances of her death seem incomprehensible to all who knew her. Against her mother's wishes, Phoebe decides to follow Faith's path through Europe and discover the truth of what happened to her. Armed only with the postcards Faith sent to her years before, she sets out, travelling to each location her sister visited, trying to uncover the mystery of her sister's death.