In a house overlooking Dublin Bay, Mimi and her daughter Grace are disturbed by the unexpected arrival of Grace's daughter Polly, and her striking new boyfriend. The events of the next few days will lead both of them to reassess the shape of their lives. For while Grace's visitors focus her attention on an uncertain future, Mimi, who receives a messenger of a very different kind, must begin to set herself to rights with the betrayals and disappointments of the past.