When her best friend is moving away and her mom has arranged for some strange little girl to come and stay with them, Ash - who is petrified of change and new people - is expecting the worst summer of her life. Then seven-year-old Claire shows up. Armed with a love of thrift-store clothes and an altogether too-sunny disposition, Claire proceeds to turn Ash's carefully constructed life upside down.While every part of Ash's life seems to be disrupted, she must protect a carefully hidden secret: She has discovered a magical jar in her basement. It's a wish jar, full of someone's old wishes - and it has the power to send her back in time and provide a window into another friendship between two girls. Discovering her own connection to the girls' story shows Ash that her life is full of surprises and friends she never saw coming.