As long as she can remember, Leah has had the mysterious feeling that she's searching for a twin—that she belongs as one of an intimate pair. It begins with friends, dance partners, and her own reflection in the mirror as she studies ballet growing up; continues with physical and emotional attractions to girlfriends in college; and leads her, finally, to Eric, whom she moves across the country for and marries. But her steadfast, monogamous relationship leaves her with questions she can't answer about her sexuality and her identity, so she and her husband decide to try an open marriage.

How does a young couple make room for their individual desires, their evolving selfhoods, and their artistic ambitions while building a life together? Can they pursue other sexual partners, even live in separate cities, and keep their passionate original bond alive? Vanishing Twins looks for answers in psychology, science, pop culture, art, architecture, Greek mythology, dance, and language, to create a lucid, suspenseful portrait of a woman testing the limits and fluidities of love.