Daisy Shoemaker can't sleep. With a thriving cooking business, full schedule of volunteer work, and a beautiful home in the Philadelphia suburbs, she should be content. But her teenage daughter is rebelling, her husband can be distant, her work can feel trivial, and she's lost the only real friend she's ever had. Still, Daisy knows she's got it good. So why is she up all night? As Daisy starts receiving misdirected emails meant for a woman named Diana Starling, whose address is just one punctuation mark off, she imagines a more glamorous single-lady life, miles away from her own. While Daisy's driving carpools, Diana is traveling the world. While Daisy's making dinner, Diana's making plans to reorganize corporations. An apology leads to an invitation, and the two women meet and become friends. But, as they get closer, we learn that their connection was not completely accidental. Who is Diana, and what does she want with Daisy? From the manicured Main Line of Philadelphia to the wild beaches of the Outer Cape, Jennifer Weiner's vibrant wit and brilliant observations bring to life the story of two strangers who find they can only move forward with their lives by confronting their shared past.