For Willa Jacobs, seeing her best friend, Jane Weston, is like looking in a mirror on a really good day. Strangers assume they are sisters, a comparison Willa secretly enjoys. They share an apartment, clothing, and groceries, eking out rent with part-time jobs. Willa writes advertising copy, dreaming up inspirational messages for tea bags, while Jane cleans houses and writes poetry about it. Together Willa and Jane are a fortress of private jokes and shared opinions, with a friendship so close there's hardly room for anyone else. But when Ben, Willa's oldest friend, reappears and falls in love with Jane, Willa wonders: Can she let her two best friends find happiness with each other if it means leaving her behind?