During their first summer apart, four teenage girls, best friends since earliest childhood, stay in touch through a shared pair of secondhand jeans that magically adapts to each of their figures and affects their attitudes to their different summer experiences.
As their lives take them in different directions, Lena, Tibby, Carmen, and Bridget discover many more things about themselves and the importance of their relationship with each other.
Ama, Jo, and Polly, three close friends from Bethesda, Maryland, spend the summer before ninth grade learning about themselves, their families, and the changing nature of their friendship.