"High school English teacher Polly Goodman can talk about everything and anything with the women in her book club, which is why they've become her closest friends and, along with the support of her veterinarian husband, the bedrock of her life. Her private school students, her fraught relationship with mother, her struggles with IVF-Polly's book club friends have heard it all. But when they give Polly an ancestry test kit as a joke, the results match her with a stranger. Despite it seeming clear that this match is a mistake, Polly cannot help combing through her own family...