Years ago, Nora Bridge walked out on her marriage and left her daughters behind. She has since become a famous radio talk-show host and newspaper columnist beloved for her moral advice. Her youngest daughter, Ruby, is a struggling comedienne who uses her famous mother as fuel for her bitter, cynical humour.
When the tabloids unearth a scandalous secret from Nora's past, their estrangement suddenly becomes dramatic. Nora is injured in an accident and a glossy magazine offers Ruby a fortune to write a tell-all about her mother. Under false pretences, Ruby returns home to take care of the woman she hasn't spoken to for almost a decade.
Nora insists they retreat to Summer Island, to the lovely old house on the water where Ruby grew up, a place filled with childhood memories of love and joy and belonging. There Ruby is also reunited with her first love and his brother. Once, the three of them had been best friends, inseparable. Until the summer that Nora had left and everyone's hearts had been broken . . . .