On the fifth anniversary of his sister Janine's death, nineteen-year-old Jonny Dart is still troubled by guilt and an imperfect memory of the accident that took her life. He goes searching for the only other witness to the fatal event, his sister's best friend. But instead of finding the answers he's looking for, he finds Sophie - an old woman with Alzheimer's.
Sophie lives with several cats in genteel squalor, and has no memory of recent events. As a temporary outcast and labelled a loser, Jonny takes refuge with her. In Sophie's house, past and present merge for both Sophie and Jonny. Their accidental meeting changes their lives.