It was the day when everything stopped, and something started that was quite different, that couldn't be controlled or shaped or ended. At quarter past two on a Wednesday afternoon, Anna leaves her big sister, Rose, dozing on a sun lounger in the garden and goes out to the shops. She never sees her again. 20 years later, and the tragedy of Rose's mysterious disappearance still haunts her family. Convinced that she is still alive, Anna begins to search for her lost sister.