When half-sisters Kat, Flora and Lauren are unexpectedly summoned to Rock Point, the remote Cornish house where they spent their childhood summers, it is the first time they have been there together since their artist father painted them in the celebrated Girls and Birdcage. Since then they have drifted apart into wildly different lives, each one determined to forget the fateful summer of twenty years ago. But when they arrive at Rock Point it is clear they are not alone. Someone is lurking in the shadows, watching their every move. Someone who remembers what they did, and has been waiting for their return. As the events of that summer rise closer to the surface, will the three sisters escape unscathed for a second time? Or are some secrets too powerful to remain under lock and key?