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.