The Carsons and the Whitmans are two families whose teenage children get along well and spend their summer holidays in the same house. But parents don't always have time to watch their children, and a series of events occurs that shatters the summer idyll. More than ten years later, Olivia, the Carsons' beloved daughter, meets a strange, poorly spoken teenager, Josh, who turns out to be the son of her younger sister Lily. Due to a long-standing quarrel, Olivia and Lily do not communicate, but now Olivia will have to find her sister, and at the same time deal with long-standing family secrets that have poisoned her life for years.